Writing back comments without PowerApps

Is there a way to writeback to a DB2 database without using PowerApps? I have a table visual with close to 30K records and PowerApps has a limitation it seems of only 1000 records.

Use case: Have a table visual with multiple columns. Users want to add comments for certain rows and expect those comments to be saved back to the DB2 database.
Tried using a PowerApps visual but when i add fields to the visual, nothing happens. I don't get an option to "Select exisiting app" or "Create a new app" as seen in multiple solutions and videos.

Could it mean PowerApps isn't supported in my company? And is there a better way to save comments without using PowerApps?