At this moment it seems not possible to have triggers on tables in PowerApps.
Because of this, relatively basic apps with some logic in table triggers can not be created.
As posted by pretty much everyone else in this comment section, how is this not a feature that is already implemented? I understand there are plenty of moving parts under the hood but to leave this as "Planned" for years is simply unacceptable. If this is going to be implemented please update us. If it isn't let us know so we can find a long term workaround to this problem. Simply telling us to "Not use triggers" isn't a solution. These triggers are required for auditing so deleting them is not really an option.
I would like to echo this. Seems like a pretty essential function.