How do I to get PCM 7.1 audio to work on Apple TV 4 from a DTS-HD MA 7.1 or TrueHD 7.1 movie?

Plex transcodes TrueHD 7,1 to FLAC (…) I think it does the same for MA 7.1 but I’m not sure.

Well that’s the strange part. It does indeed do this for TrueHD, so that’s alright. But for DTS-HD MA 7.1, it says that it is Direct Playing the DTS-HD MA 7.1 stream, but my receiver only receives 5.1 sound from the AppleTV, not 7.1. If it where forced to transcode to FLAC 7.1 as well there would be no problem for me, since that is mostly the same. Big issue for me to mis the two channels from 7.1 to 5.1 though.

Here are two examples:

First one, TrueHD 7.1. Tautulli reports it is transcoding to FLAC 7.1, Receiver sees 7 channels + LFE.

Second one, DTS-HD MA 7.1. Tautulli reports it is Direct Playing DTS 7.1, Receiver sees 5 channels + LFE, so the bottom two speakers on the receiver are ‘missing’.
If this where also transcoded to something like FLAC 7.1. it would be fine.