How to add custom functions to run in Selenium ActionChain/ActionBuilder?

I used to be able run custom function by appending to the _actions variable in ActionChain like below.

action = ActionChain(driver)
action._action.append(lambda: func())

It seems like now if drivers are w3c they are instead run by ActionBuilder object. The ActionBuilder class doesn’t seem to have a singular queue to run actions in order like ActionChains. Anyone that is more familiar in selenium point me in the right direction?