Preprocessing before matching in custom rules?

I have a very specific use case where I would like to use custom DevSkim rules on.

I described the situation here: https://github.com/jqlang/jq/issues/566#issuecomment-2525047098 which I moved into a discussion here: https://github.com/jqlang/jq/discussions/3218.

For DevSkim purposes this for now can be considered a 'custom and unsupported language', JQ. JQ in itself is not valid JSON but in my use-case a large part of it is JSON. To avoid writing very complicated regular expressions on a complicated file structure only, if I enclosed it in placeholders like in below example.

{
  "name": "Example",
  "data": [
    # __JQ_START__
    .input | map({ key: .key, value: .value })
    # __JQ_END__
  ]
}

Is there a way in DevSkim to first use regex to remove everything in between the placeholders, including the placeholders itself, and then use JSONpath on the remainder, which is now fully JSON?

Or visa versa remove everything outside the placeholders including the placeholders, and do another regex on the remainder (JQ only)?

Start with the linked jq issue comment and the jq discussion, then trace how DevSkim custom rules perform matching and whether preprocessing is currently supported. Done means establishing whether either placeholder-based processing direction can be supported for the shown JQ/JSON example and documenting the resulting behavior or limitation.