No audio in output

So, two years after this issue was brought up on this forum, has this matter been solved?

Is this issue because of ‘vernacular audio writing system’ not being supported by DAB? Or, because of audio natively recorded within FLEx is supported (audio on both headwords as part of ‘pronunciation’; as well as audio as a ‘vernacular writing system’ on example sentences) but audio imported into FLEx is not?