PyBIDS: Filtering derivatives, use "desc" and "space" entities?

It is fairly easy to use PyBIDS to filter raw datasets; however, filtering derivatives requires the ability to parse the “desc” and “space” entities, which PyBIDS (v0.14.0) does not seem to support.

Is there a config file or similar that I could edit to add the ability to filter the “space” and “desc” entities? Or is there a separate preferred method for filtering derivatives?

If I am correct I think that this is supposed to be implemented in that unmerged pull request.

The diff on the config file would this one if you need to implement it.