Deleted5371 charting is gonna work through multiple ways.
first and second methods: RoBeats/Osu Charting. I already made a RoBeats to Coder Engine translator in the github. you can find it in the github channel on the discord
third method: straight up copy and pasting the contents of a json file in a song into a string and i made a script to convert that into a Coder Engine song. its not on the github yet, but here it is: FunkinToCoderEngine
fourth method: it may be very painful but you CAN make a chart manually. like typing out every note.
and the way to add those charts is to just remix the project, name the project to the name of the mod, put the chart into an array (ex. var chart = [new note("Left", 0 0), etc.]; ) and there the chart is!
also i just wanna say, big dedications to @Varrience for helping a lot with charting and stuff. he didnt chart any songs, but he did help make the entire charting system, so big thanks to them!