It seems that the only program capable of handling and conversion of .ra2 raw images is the very same program that was used to create them, Flare for Mac. It is unlikely any other software can be used for this purpose, so this remains your only choice.
Convert Flare RAW file to Aldus Tagged Image File Format (TIFF) bitmap image.
We have found one software suitable in our database for this conversion.
Apple macOS / Mac OS X software - convert ra2 to tiff on OS X
Flare for Mac is graphic editor used to add effects and adjusting images and photos. Flare contains built-in presets to customize photos and dozen of individual photographic effects.
Convert from ra2 file
to tiff file
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.