How can I set the marker per item in a bullet point list?

You can easily do that too:

#import "@preview/cheq:0.2.2": checklist
#import "@preview/fontawesome:0.5.0": *

#show: checklist.with(marker-map: (
  "x": fa-x(),
))

- [ ] a
- [x] b

Note that the fontawesome package requires you to first manually install the font, since packages can’t ship fonts at the moment. See the package page for instructions:

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