I talked with Simon Phipps who pointed me at:
Apparently to make our APK run nicely on Chrome out of the box we need to add a cbz file to the APK and play with / require / install the chromeos-apk-tool.
Would be great if someone could look into that - hopefully it's not too hard to add to the flow in:
Migrating Whiteboard tags to Keywords: (EasyHack DifficultyBeginner SkillScript TopicCleanup)
JanI is default CC for Easy Hacks (Add Jan; remove LibreOffice Dev List from CC)