Ooooh PS5 is uncompressed? That's it. So the device that I posted can help?? 

As I said before you have to check if it supports the necessary hdmi connections I mentioned above. 
I won‘t open an unknown https link posted here. 😉

Oh, understood. It's this one. Here are the specs:

Specification:

※Mode Name:HDMI eARC/ARC Audio Extractor

※Input channel:HDMI port x1

※Output channel:HDMI port x2,RCA port x2,Optical port x1

※eARC features:Support Optical,L/R,HDMI OUT2 output

※ARC features:Support Optical,L/R,HDMI OUT2 output

※Video format:HDR,UHD,HLG,Dolby Vision

※Resolution format:480P/720P/1080P/4K@30Hz/4K@60Hz

※Deep color:8/10/12Bit@480P/720P/1080P 8Bit@2160P

※HDMI In/Out Supported Audio Format:Dolby HD/DTS HD/Dolby Atoms/Dolby AC3/DTS/LPCM etc.

※Digital audio output supported audio format:LPCM2.0/DTS/DOLBY-AC3……

※HDMI Input cable length:2160P/AWG 26 ≤3m;1080P/AWG 26 ≤10m

※HDMI Output cable length:2160P/AWG 26 ≤3m;1080P/AWG 26 ≤10m

※DAC sample frequency range:32～192 KHz

※HDMI transmission bandwidth:25~600MHz

※HDMI transmission rate:0.75~18Gbps

※P specification: Input: AC 100~240V Output: DC 5V/1A

※Max working current:600mA

※Size:139x64.5x22.3 (mm)

※Weight:225g

※Accessories:Manual, Power Adaptor

@Thrash 

As expected this device has NO hdmi INPUT that supports eARC. 
So it WON‘T work for you. 

Really? 

I though "HDMI In/Out Supported Audio Format:Dolby HD/DTS HD/Dolby Atoms/Dolby AC3/DTS/LPCM etc." meant it supported it =(

Once again… to connect a Sonos ht device  you need a hdmi in port that supports eARC. The linked device hasn’t got one.