response body file may be stored with .hbs, .json.hbs or similar extensions, so that language support in the IDE aligns rather with working with Handlebars.
Con: in this case, JSON mapping specific code completions, inspections, etc. are not available.
The file type can be overridden in the editor for the currently edited file, without modifying the file extension. You can invoke the Override File Type action, and select Handlebars from the list of languages.
This won't be implemented, at least not for now.
There are some alternative solution to this:
.hbs
,.json.hbs
or similar extensions, so that language support in the IDE aligns rather with working with Handlebars.