Welcome Gianluca.
If you use SendMessage() which will launch the phone’s default text messaging app with the message and phone number prepopulated, you probably can post to Google Play.
However, if you use SendMessageDirect() which sends a text message automatically to send a text message. Using this block will add dangerous permissions that will require additional approval if your app is submitted to the Google Play Store.
there is nothing you can do with permissions. Google will not allow your app to be published because of their latest security rules. You could petition Google however experience of AI developers is that you probably will not be granted a variance. You can try; discuss with GooglePlay.