.chd support for Libretro file picker

Can .chd be added as a valid format for the rom file browser? My Dreamcast collection is all in .chd, I use it fine with standalone Flycast. The space savings are significant with .chd for many games so I’d like to not have to convert all my games, no matter how small, to bloated 1GB messes. I know the format is also used for Saturn, Sega CD, PS1, and certain MAME sets; so it would benefit many consoles.
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