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 Rio                                          (ID: 1a1rh) (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: B
  Season: 2020 (current: False)
  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
2/28/20   4:00 PM    Bangu           1-0   Portuguesa      (ID: g110jh9)
2/28/20   7:00 PM    Volta Redonda   1-0   Macae           (ID: g110jhe)
2/29/20   6:00 PM    Cabofriense     1-4   Flamengo        (ID: g110jhb)
2/29/20   7:00 PM    Resende         1-1   Vasco da Gama   (ID: g110jhd)
3/1/20    4:00 PM    Fluminense      5-1   Madureira       (ID: g110jhc)
3/1/20    7:00 PM    Botafogo        2-1   Boavista        (ID: g110jha)
3/6/20    7:15 PM    Boavista        2-1   Bangu           (ID: g110jhf)
3/7/20    4:00 PM    Cabofriense     1-4   Portuguesa      (ID: g110jhg)
3/7/20    4:00 PM    Macae           0-3   Madureira       (ID: g110jhj)
3/7/20    6:00 PM    Flamengo        3-0   Botafogo        (ID: g110jhh)
3/8/20    4:00 PM    Volta Redonda   0-0   Vasco da Gama   (ID: g110jhk)
3/8/20    6:00 PM    Fluminense      4-0   Resende         (ID: g110jhi)
3/14/20   4:00 PM    Resende         0-1   Macae           (ID: g110sfv)
3/14/20   6:00 PM    Flamengo        2-1   Portuguesa      (ID: g110jhp)
3/14/20   7:00 PM    Boavista        2-0   Cabofriense     (ID: g110jhm)
3/15/20   4:00 PM    Botafogo        1-1   Bangu           (ID: g110jhn)
3/15/20   6:00 PM    Vasco da Gama   0-2   Fluminense      (ID: g110jhs)
3/16/20   4:00 PM    Madureira       2-1   Volta Redonda   (ID: g110jhr)
6/18/20   9:00 PM    Bangu           0-3   Flamengo        (ID: g110jht)
6/19/20   3:30 PM    Portuguesa      0-0   Boavista        (ID: g110jhx)
6/28/20   11:00 AM   Botafogo        6-2   Cabofriense     (ID: g110jhu)
6/28/20   3:15 PM    Madureira       0-2   Resende         (ID: g110jhw)
6/28/20   4:00 PM    Vasco da Gama   3-1   Macae           (ID: g110jhy)
6/28/20   7:00 PM    Fluminense      0-3   Volta Redonda   (ID: g110jhv)
7/1/20    3:15 PM    Bangu           1-0   Cabofriense     (ID: g110jhz)
7/1/20    9:30 PM    Flamengo        2-0   Boavista        (ID: g110ji0)
7/1/20    9:30 PM    Portuguesa      0-0   Botafogo        (ID: g110ji2)
7/2/20    5:30 PM    Macae           0-0   Fluminense      (ID: g110ji1)
7/2/20    8:00 PM    Vasco da Gama   1-0   Madureira       (ID: g110ji3)
7/2/20    8:00 PM    Volta Redonda   2-1   Resende         (ID: g110ji4)
GamesEnd