You can add leagues, big or small, to Sports Club Stats.
   It's free.
   It's easy.
   Just email import@sportsclubstats.com the:
      structure
      schedule
      and rules
   In a few minutes you'll get back a link to the league.
   Play around, have fun, you won't break anything.
   I look forward to seeing what you create.

Info about the various settings:
   https://docs.google.com/document/d/1-UneDNk6tkOrc_B-WBnGnc5KGiy2kttXC2fW8dR7QzM/edit?hl=en

For example, here is what created this league:

LeagueBegin
  League:       Taca Guanabara                                    (ID: 1a1rg) (Sort: Conf)
    Conference: Grupo A                                           (ID: d13p0) (Sort: Div) (Playoffs: 2)
      Team:     Bangu Atletico Clube              (Bangu)         (ID: t16dq)
      Team:     Boavista Sport Club               (Boavista)      (ID: t16dr)
      Team:     Botafogo de Futebol e Regatas     (Botafogo)      (ID: t11hg)
      Team:     Associacao Desportiva Cabofriense (Cabofriense)   (ID: t16zc)
      Team:     Clube de Regatas do Flamengo      (Flamengo)      (ID: t11hk)
      Team:     Associacao Atletica Portuguesa    (Portuguesa)    (ID: t16dv)
    Conference: Grupo B                                           (ID: d13p1) (Sort: Div) (Playoffs: 2)
      Team:     Fluminense Football Club          (Fluminense)    (ID: t11hm)
      Team:     Macae Esporte Futebol Clube       (Macae)         (ID: t16p0)
      Team:     Madureira Esporte Clube           (Madureira)     (ID: t16dy)
      Team:     Resende Futebol Clube             (Resende)       (ID: t16e2)
      Team:     Club de Regatas Vasco da Gama     (Vasco da Gama) (ID: t11i2)
      Team:     Volta Redonda Futebol Clube       (Volta Redonda) (ID: t16e4)
  Kind: pro
  Sport: soccer
  Gender: male
  Country: Brazil
  State: Rio de Janeiro
  Level: A
  Season: 2020 (current: True)
  Author: Marcos Vilhena
  Note: 
  LotteryNote: 
LeagueEnd

SortBegin
Div: Points, Wins, GoalsDelta, GoalsFor, Points HeadToHead, DrawLots
Conf: MoveClinchedToFrontBySeed, Points, Wins, GoalsDelta, GoalsFor, Points
HeadToHead, DrawLots
SortEnd

RulesBegin
  PointsForWinInRegulation:  3
  PointsForWinInOvertime:  3
  PointsForWinInShootout:  3
  PointsForLossInRegulation:  0
  PointsForLossInOvertime:  0
  PointsForLossInShootout:  0
  PointsForTie:  1
  PercentOfGamesThatEndInTie:  0.24
  PercentOfGamesThatEndInOvertimeWin:  0
  PercentOfGamesThatEndInShootoutWin:  0
  HomeFieldAdvantage:  0.52
  WeightType:  Pythagorean
  WeightExponent:  1.4
  WhatDoYouCallATie:  draw
  WhatDoYouCallLottery:  lottery
  WhatDoYouCallPromoted:  promoted
  Promote:  0
  PromotePlus:  0
  PromotePlusPercent:  0
  WhatDoYouCallDemoted:  relegated
  Demote:  0
  DemotePlus:  0
  DemotePlusPercent:  0
RulesEnd

GamesBegin
TeamListedFirst: home
1/18/20   4:00 PM   Flamengo        0-0   Macae           (ID: g110jg7)
1/18/20   4:00 PM   Madureira       1-0   Portuguesa      (ID: g110jg8)
1/18/20   4:30 PM   Resende         0-0   Boavista        (ID: g110jg9)
1/18/20   6:00 PM   Volta Redonda   1-0   Botafogo        (ID: g110jga)
1/19/20   4:00 PM   Vasco da Gama   0-0   Bangu           (ID: g110jgb)
1/19/20   7:00 PM   Fluminense      1-0   Cabofriense     (ID: g110jgc)
1/21/20   4:00 PM   Madureira       2-0   Botafogo        (ID: g110jgd)
1/22/20   4:00 PM   Macae           0-3   Boavista        (ID: g110jge)
1/22/20   4:00 PM   Volta Redonda   4-0   Cabofriense     (ID: g110jgf)
1/22/20   9:00 PM   Vasco da Gama   0-1   Flamengo        (ID: g110jgg)
1/23/20   4:00 PM   Resende         1-1   Bangu           (ID: g110jgh)
1/23/20   8:00 PM   Fluminense      2-0   Portuguesa      (ID: g110jgi)
1/25/20   4:00 PM   Cabofriense     0-1   Madureira       (ID: g110jgj)
1/25/20   6:00 PM   Flamengo        3-2   Volta Redonda   (ID: g110jgk)
1/25/20   7:00 PM   Boavista        0-1   Vasco da Gama   (ID: g110jgm)
1/26/20   4:00 PM   Bangu           1-5   Fluminense      (ID: g110jgn)
1/26/20   4:00 PM   Portuguesa      1-0   Resende         (ID: g110jgp)
1/26/20   7:00 PM   Botafogo        3-1   Macae           (ID: g110jgq)
1/28/20   7:15 PM   Boavista        3-1   Madureira       (ID: g110jgr)
1/29/20   4:00 PM   Bangu           0-1   Volta Redonda   (ID: g110jgt)
1/29/20   4:00 PM   Portuguesa      4-1   Macae           (ID: g110jgs)
1/29/20   8:30 PM   Flamengo        0-1   Fluminense      (ID: g110jgu)
1/30/20   7:15 PM   Botafogo        2-1   Resende         (ID: g110jgv)
1/30/20   9:30 PM   Vasco da Gama   0-1   Cabofriense     (ID: g110jgw)
2/1/20    4:00 PM   Madureira       0-0   Bangu           (ID: g110jgx)
2/1/20    7:00 PM   Boavista        1-0   Fluminense      (ID: g110jgy)
2/2/20    4:00 PM   Botafogo        1-0   Vasco da Gama   (ID: g110jgz)
2/3/20    4:00 PM   Macae           1-0   Cabofriense     (ID: g110kps)
2/3/20    6:00 PM   Volta Redonda   2-0   Portuguesa      (ID: g110jh2)
2/3/20    8:00 PM   Resende         1-3   Flamengo        (ID: g110jh1)
2/8/20    4:00 PM   Bangu           1-0   Macae           (ID: g110jh4)
2/8/20    6:00 PM   Boavista        2-1   Volta Redonda   (ID: g110jh5)
2/8/20    6:00 PM   Flamengo        2-0   Madureira       (ID: g110jh3)
2/9/20    4:00 PM   Cabofriense     2-3   Resende         (ID: g110jh6)
2/9/20    4:00 PM   Fluminense      3-0   Botafogo        (ID: g110jh7)
2/9/20    4:00 PM   Portuguesa      2-3   Vasco da Gama   (ID: g110jh8)
GamesEnd