For generating gerbers: https://jlcpcb.com/help/article/362-how-to-generate-gerber-and-drill-files-in-kicad-7
For generating BOM/CPL: https://dubiouscreations.com/2019/10/21/using-kicad-with-jlcpcb-assembly-service/

tweaks to CPL file:

J1-J7 - remove
J8, J9 - 180 degrees, subtract 1.75 from Y position
U6, U7 - check rotation
U2 - check rotation
Y1 - check rotation