If you have multiple hosts on a single booking page, it is not possible to specify the person in charge on that booking page.
In order for guests to be able to select their own host, a separate booking page must be created for each host.
If you use the team page, it is possible to display a list of members and allow guests to select a member.
It can be accessed from the icon in the lower left corner of the dashboard.
Display the tab for the member list and tell the guest its URL.