Is it somehow possible to convert .flh animations to .mp3 format?
Converting FLIC Animation Files directly to MP3 Audio Files (.flh to .mp3 conversion) might be possible, even though your options are quite limited. It relates to users attempting to extract the audio track (MP3) from an FLH animation.
Use a media editing software or (online) conversion tool, such as Freemake Video Converter, which should allow users to import FLH animations and export their extracted audio tracks in MP3 format.