It is possible to share the screen of your mobile device with Loola.
You will need some additional tool to capture the screen of the mobile device to your desktop, and from there to Loola.
Some tools that enable iOS/Android screen capture on desktop:

Once you have the Windows/Mac drivers of the above alternatives installed on your desktop, you should be able to select them in Loola as a video source.
Alternatively, you could use a multi-source software like OBS/Wirecast/EcammLive and capture the combined output in Loola.   

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