Simplest answer based on what I know.
- I have the same TV. Built in sound is a lot better than most.
- I have a soundbar (Yamaha ATS-1080 from Costco) which helps even people with normal hearing
- I have a link to the TV with a TV connector from the manufacturers of my HAs which provides perfect clarity. The one issue is that if someone wants to talk to me I have to pause the TV to listen as the TV sound dominates the HAs.
In summary, buying a TV link device from your HA manufacturer is the best solution by a mile.