With backwards compatibility on PS5, I'd say no.
A certain amount of Cr. may be transferrable(as per GT4). Of course I don't know this, but that would be more likely than the actual content from GTS to GT7. They are separate games, if you get my meaning.
From the GT7 Master Car & Track list threads and the trailer(s), it's possible.Would the GTS tracks and cars be imported to gt7 at least?