The Librem 5 has no capability to access radio at all (whether AM, FM or DAB). So I think we can assume that the OP means “streamed via the internet”. In Australia DAB is mostly offered in parallel with FM i.e. both are offered and you use whatever your equipment is capable of (e.g. older cars simply can’t do DAB), and some low budget radio stations don’t do DAB anyway.
But if you want to play with SDR on the Librem 5: New Post: My First Year of Librem 5 Convergence - #9 by Kyle_Rankin so with an SDR dongle, you may be able to access AM and/or FM and/or DAB directly on the phone i.e. without internet. 