Hello @byDagor. First of all, thank you so much for doing this it looks really cool.
Thank you. thank you. thank you.
I tried to order some Janus Controllers from JLC pcb but it seems that the website has changed and required the BOM and pick and place files to be in a different format.
I know ki-cad now has a plugin that allows you to generate all the manufacturing files for JLC PCB in the new style. I'm sure whatever tool you are using might have the same feature.
If there is a way that I can help you with this please let me know.