Connecting Smart Watch (Anio 5)

Hi guys,

I am using:

Platform information:
Hardware: NUC7CJYH with 8 GB RAM and 32 GB SSD + zwave: Aeotec Z-Stick Gen5 (ZW090)
Ubuntu Server 20.04
OH 3.1 stable

I recently bought a Anio 5 Smartwatch for our son:

(sorry - in German only)

Unfortunately there is just an App (Android and iOS), but no Web interface or API.
The only option to communicate with the device beside the app is SMS “request position” or “restart”.
However, the Watch only responds, if the sender’s phone has installed the App and is linked to the watch (which of course makes sense security wise).

I just would like to get the position of the watch into OH and I wonder if this is possible at all.
So any suggestion would be greatly appreciated.