Probably these extensions are not quite simple, and are aimed at experienced extension creators.
Two suggestions for new extensions:
An audio player that masters seamless (gapless) looping and that also works in the background (ie when the device is in sleep / idle mode or when the current screen is not visible after pressing the device home button). Ideally, the player should also be capable of streaming.
Note: The Player component does not loop seamlessly since Android 6. The TaifunPlayer does not loop gaplessly on specific Chinese devices (OnePlus, Xiaomi, …) anymore. (Finally I found the reason for this: these manufacturers fade out audio tracks with a length ≥ 30000ms for 165ms, which creates the gap.)
The ExoPlayer component in Kodular does not work in the background on some popular devices (with the old Android Support Library; an update to the AndroidX library is NOT planned).
A statistics extension that records the usage of an app. On which day, period (week, month, year) which exercise, function, game etc. was carried out for how long and how often. Best of all with a graphical processing (diagrams).
These extensions also address all AI clones, especially Kodular.
Of course, I’m willing to pay for it.