There are those optionel rules in DMG page 272 (if you want to use them):
1)OVERRUN
When a creature tries to move through a hostile creature's space, the mover can try to force its way through by overrunning the hostile creature.
As an action or a bonus action, the mover makes a Strength (Athletics) check contested by the hostile creature's Strength (Athletics) check. The creature attempting the overrun has advantage on this check if it is larger than the hostile creature, or disadvantage if it is smaller.
If the mover wins the contest, it can move through the hostile creature's space once this turn.
2)TUMBLE
A creature can try to tumble through a hostile creature's space, ducking and weaving past the opponent.
As an action or a bonus action, the tumbler makes a Dexterity (Acrobatics) check contested by the hostile creature's
Dexterity (Acrobatics) check.
If the tumbler wins the contest, it can move through the hostile creature's space once this turn.