i found a way. vavle released an update for steam today. now it is possible to add every .exe file into steam and start it with proton. so i downloaded the windows version, added om101.exe into steam and forced it to start with proton 3.7-8. it works!
longusnickus
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A member registered Jul 11, 2018
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wont start on kubuntu 18.10, mesa 19
config file: GAMEDIR/om101-linux/config.json
jar: GAMEDIR/om101-linux/om101_drm_free.jar
mainClass: eu/tulevik/officemanagement101/desktop/DesktopLauncher
vmArg 0: -Xmx1G
jre: GAMEDIR/om101-linux/jre/lib/amd64/server/libjvm.so
terminate called after throwing an instance of 'std::system_error'
what(): Enable multithreading to use std::thread: