One question is it possible to connect to his hotspot so that it is displayed as WLAN? For example, with Minecraft on the mobile phone you always have to be connected to a WLAN to play online
If you use your mobile phone as a hotspot, the other devices connected to it are practically in the WLAN.
Yes, right and the question is whether there's any way that you can do it on your own device somehow
No, that would also be pointless. Isn't it possible to turn off the option "only via WLAN" in the game settings?
Not that I know of but I'll have a look