I did not, Kovid did, very quickly after I opened a ticket some releases ago. So djvu now works perfectly. I had a look at the new plugin script and tried to do the same for djv and all other formats supported by FBreader or .cbz since the latter can now be read on the device,
https://wiki.mobileread.com/wiki/Digi...e_applications
but I was unable to make it work. For instance it is not clear to me whether djv has an entry in calibre.devices.mime or how to check that ....