Yes! You can stream mobile games and mobile apps directly from your mobile phone with the help of a mobile screen recorder that supports RTMP streaming.
Some screen recorders supporting RTMP are:
Once you get a mobile screen recorder with live streaming via RTMP, you can start streaming to Loola.
Alternatively, if you'd like to use RTMP and have your phone act as a camera, you can try this:
Camera for OBS Studio (iOS)
Check the following article on how to configure Loola's RTMP key: