When export bom and position from cm4io board project, the cm4 library and generated data for itself not two DF40C-100DS-0.4v connector as material and position, this is really confusing
So my solution
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Create Two Text in footprint and name it as BOM_A*, then place its position and rotation as connector
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Create Fields with same name in symbol to store the footprint name
BOM_A1 -> DF40C-100DS-0.4V
BOM_A2 -> DF40C-100DS-0.4V -
use custom export script to read text data and export,this is the GitHub link for my script, it can export ready to use csv for JLC
https://github.com/Huibean/KiCAD_JLC