Thanks @Gaukler_Faun!If you press on the lockscreen "emergency call" and then on the emergency call screen "emergency information" (or something like this - I use German language), you can enter a lot of information...
Hope this helps.
Regards
Gaukler Faun
I'll check it out. It's at least better than nothing, even if it requires the honest finder of a phone to know where to look....