Arc soundbar

There are two ‘versions’ of Atmos, one that’s transported by Dolby Digital Plus, another by TrueHD. Both are true Atmos, just different types. It’s unlikely, in my uninformed opinion, that you’ll be able to hear the difference between the two when using a sound bar, whether it’s a Sonos sound bar, or another company. I suspect you’d need a full blown system with many speakers to hear the difference. 

TrueHD does require eARC, which your TV does not have. 

I would be totally content with the Dolby Digital Plus version. I just need to know if my 📺 has that.

As I indicated, it’s not explicitly stated in the manual, you’d need to contact LG. 

There is a lot of detail on https://www.rtings.com/tv/reviews/lg/sk8000 and it says that Atmos is only provided over DD+.

How does Atmos True HD differ from DD+
Does that mean my Tv 📺 will at least be able to play Atmos over DD+ since it supports DD+?

TrueHD is lossless, DD+ is lossy, but not as lossy as regular DD.  You should be able to get Atmos from your TV, but only the manufacturer can tell you with certainty.

Ratings.com says that my tv 📺 supports DD+ so I should be good to go but I will definitely be reaching out to Lg to confirm tomorrow.

What is your actual source? ie what is providing the Atmos audio? That will also affect whether you will be able to hear it on the Sonos Arc.

I suppose my TV 📺 is being that it’s Dolby Atmos compatible.

I’m able to stream Atmos now with my Sony soundbar.