Unfortunately, we do not know about any possible bzz to jpg conversion or why it would be useful to do so. It appears that .bzz projects used in BuzzBundle do not contain any images at all, so some kind of export seems highly unlikely.
Google results also confuse bzz with bz2 extension, in most cases because of machine-read publications. BZ2 format is used for archives, so if your pictures are compressed in this manner, you will need to use a file converter to recover the JPEG pictures - that is, if they are really inside the .bz2 file.
If you are looking for something specific, or know anything useful about how to convert bzz to jpg, please leave us a message in the discussion below.Open BZZ file Open JPG file