How to upload new parameter mata data?

I made a custom firmware for my Pixhawk where I added a few value options for one parameter. In QGroundControl, I cannot see the new value options, but I can use the options with manual input. The firmware I use is ArduSub. With Mission Planner, I can edit ParamMetaData.xml to make the needed change in the GCS software. Is there something similar in QGroundControl?

See this GitHub issue where I originally posted the problem.

Look in src/FirmwarePlugin/Px4 there should be a PatameterMetaData.XML file or similar.