I ran into this problem too. I am working on some templates for a model boat builder customer and he wanted a centerline and waterline engraving on them.
I found a link on doing some operation in 360 PATCH mode and got it to work, but can’t find the link again.
I like the Glowforge Colorific post processor in 360 CAM mode. It generates an svg file I can load into Inkscape, where I can add text or other objects, save as plain svg and load directly into GFUI.
Great work Jason @Secret_Sauce on the videos. Sincerely appreciate what you are doing and hope you are allowed to continue.
edit found the link:
Fusion 360 Rendering Lines Question
See @chris1 comment