Ability to add files to the compressed filesystem without having to decompress/recompress the whole thing

I'm experimenting with using DwarFS for a very similar use case as yours (a build of each Rakudo commit). However, given there are several new commits every day, creating a new DwarFS image from scratch each time doesn't make sense. Would it be possible to add new data to the compressed filesystem without having to decompress/recompress the whole thing?