This was discussed in EEVBlog last year:
https://www.eevblog.com/forum/eda/color-pcbs/msg5157849/
And also here:
I know I know … I see your face already “oh no … silly question from silly user” …
JLCPCB is starting offering the multicolor SilkScreen
And soon or later will be followed by the other ones (if they aren’t already there with)
Sooo … I no want to use their crapy EDA for this stuff at all.
I’m wondering if KiCAD can do something about.
Indeed I tried to import a multicolor SVG into the silkscreen: it doesn’t work of course.
Needless to say that by porting a picture into the layer, ti’s not …
I’m not aware of any progress in using it without EasyEDA. But you should probably ask in EEVBlog. Or make it your challenge project, then tell us how you did it.