How to use both destination_prefix_naming and default_file_naming in Apache Beam WriteToFiles?

Question

I have an Apache Beam pipeline that is writing to files via:

with beam.Pipeline(options=options) as p:
    my_pipeline = (
        p 
        | "ReadTable" >> beam.io.Read(source) 
        | "WriteSomeFiles" >>  beam.io.fileio.WriteToFiles(
            path="/path/prefix/to/directory/",
            destination=lambda record: record["filename"],
            file_naming=beam.io.fileio.destination_prefix_naming(),
            sink=JsonSink())
        )

This successfully names the files with the "filename" entry in my record. How can I also set the suffix of the file? E.g. with default_file_naming like:

default_file_naming(prefix="my-prefix", suffix=".json")