WebOS AM app lossless question

Recently got passive speakers by Monitor Audio, and wanted to make sure I can listen to actual lossless (I'm fine with non Hi-Rez 44Hz) from my TV.

So my setus is LG C4 connected by ARC to amplifier, amp is connected to speakers. If I listen to music in Apple Music WebOS app from the TV, will it be lossless? Or should I better connect my iPhone to amp via line in 3.5 jack, or use DAC and connect it via Type-C to the amp? It's a bit tricky with all the options.

Thanks!