Japan trip 18-31 Dec 22

Hello,

My family of 6 members will be travelling to Japan with following schedule:
18 Dec arrived in Haneda Airport
18-21 Dec Tokyo
21 - 23 Dec to Nagano (Shiga Kogen, Nozawa Onsen)
23 Dec back to Tokyo
23-25 Dec Tokyo
25 Dec To Hakone
25-27 Hakone
27 Back to Tokyo
27-31 in Tokyo
31 Haneda airport

Is it worth it to buy 7 days JR pass for 6 of us? if yes, can we use it to travel to Nagano and also Hakone?

Thank you
Regards,