Kanazawa to Tokyo

Good morning
I would like to purchase the JR WEST ALLA REA PASS through you for 7 days.

Having to go to visit Nara, Kyoto, Hiroshima, Miyajina and Kanazawa, it seems like the best choice to me

I read that the route to Kanazawa is also covered

My question is whether it also includes the journey from Kanazawa to Tokyo or whether it is necessary to buy a ticket to Tokyo from Kanazawa

Thank you

No, the pass does not cover Kanazawa to Tokyo. Only as far as Joetsumyoko. You can see a coverage map here:
https://www.japan-guide.com/e/e2361_west.html

The supplement fee would be around 10,000 yen.

Doubt that pass pays off.

I'd use a JR Hiroshima-Kansai pass for the Hiroshima part of your itinerary. And one way tix ro Kanazawa and Tokyo.