Please consider adding a feature to get to the appended comment history from a sharpoint list comment filed with append and versioning turned on to appear in a power app card?
Thank you @LC1Ama for sharing,
I've had trouble trying to follow these steps (since it's in written format without screenshots/visual aids) and did not know which steps I was missing that prevented my custom form to act as it should be.
With that, I found a YouTube video that implements the solution that almost exactly same as yours. Highly recommend anyone who is still struggle taking a look at this video