The only Zee regional channel to have Dolby audio is Zee Keralam HD. Yes, Zee is very bad in this regard.
Until 2016 even Zee TV HD, Zee Cinema HD, etc. did not have DD audio. Only that year they added it. Since then Zee Cinema HD, &pictures HD, etc. display the Dolby audio logo prominently in the bottom left corner.
&flix has Dolby audio on all DTHs. If you are talking about regional audio feeds, I don't think there is any channel which has Dolby audio for them in any language other than English and possibly Hindi. Correct me if I am wrong.