MultiZarrToZarr append method - coo_map not working as expected

I have approximately 4000 kerchunk JSON files in the mentioned directory, all of which require MultiZarrToZarr processing to create a single reference file, and all require http calls. When I call the MultiZarrToZarr.translate() method on all of them at once, I encounter a server disconnected error. As a quick workaround, I thought of appending to the reference file in batches. However, I came across an error when attempting to append.

It seems that coo_map is not working as expected for the append operation

Additionally, I'm wondering if there's a way to append directly to an empty path, rather than first creating a reference file and then appending to it.

Could you please provide guidance on how to improve this approach?

Start with MultiZarrToZarr.translate() and the append path where coo_map is handled; use the reported batch-processing case with approximately 4000 kerchunk JSON files and HTTP calls to reproduce the errors. The issue names no files or tests. Done means append handling works as expected and the supported approach for appending to an empty path is documented or implemented.