I can't seem to find any information on this. Is it possible to get to the appended comment history from a sharpoint list comment filed with append and versikning tured on to appear in a power app card?
That’s exactly what needs to be done. I’d first query for the item version history. Find the appendable field name which you are looking for. Sometimes SharePoint adds a “New” prefix to the appendable column name. Filter out all of the null values after you’ve fetched it from the server.
See version history rest api query structure below for reference https://url/to/site/_api/web/Lists/getbytitle('MyListName')/items(ITEMID)/versions
Return the result as JSON from your Power Automate Flow.