Extension for FM radio? (not web radio)

I want to make an app for controlling my phone's fm receiver.
(it already has an app for this but I need to add some features).
NOT A WEB RADIO.
I haven't found any extension, one I found was for web radio.
So, is there some extension for this?
Any help is welcome.

Do smartphones still have FM radio ?

Mine does have.

Android version and device name?
(It is most likely a very old model.)

Xiaomi Note 9, Android 10.

Here is the extensions directory:

If you don't find the extension you need there, it probably doesn't exist.

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Can you use an intent (ActivityStarter) to control FM radio ?

StackOverflow implies probably not and explains why and what you might be able to do. intent set fm radio - Google Search

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