You could position the TV on the built-in

You need permission from nobody to use the space as you like.

We can't help you arrange it, as we've no clue your furnishings beyond "Large sectional".....................

It would be nice as a chat/read/spot

Four comfy arm chairs ( 30" x 36" ) at a cocktail table, a console t set up a little mini bar, tuck some cube seat pull up below.

Add rugs to define the spaces

You've plenty of room for at least a 36 x 72 dining table in the kitchen .

You can use your spaces/rooms however you want!

Makes more sense to have 2 living areas instead of 2 dining areas in a house this size.

Look........ A sectional does not a home make

You have a fire.....you read? You play a game, you do puzzles?

There is TRAFFIC to the deck. You're in NJ and it's a long winter

As little or what you can afford: )

An 8 x 10 rug, comfy chairs to share an ottoman. A game table/dining/bridge table

Or you need more

Just remember it's the summer path to the deck. You need to walk through.

Both above, 1/4 inch to a foot......