YAML with source locations?

[jackfirth]

I'm interested in parsing YAML into Racket syntax objects with source location metadata attached, so I can manipulate YAML files with Resyntax. I'd like to avoid writing my own parser. I think reusing this package might be possible if there was a way for me to get information about which part of the input file each part of the YAML document corresponds to. Would that be difficult to do?