Reserve a bus using the Fuji-Hakone pass

Hi,

I'm travelling from Odawara to Hakone, spending the day/night in Hakone, then travelling by bus to Kawaguchiko station the next day.

It makes sense for me to buy the Fuji Hakone pass as this covers all the things i'll be doing across the 2 days. I was wondering if it's possible to reserve a seat on the Fujikyu bus between Gotemba and Kawaguchiko station?

I can see you can reserve it online at https://sekitori.jp/en/ without a Fuji Hakone pass and paying for the bus reservation, but can I reserve it online with my pass?

Thanks!