how to koin Zoho Projects to a unic view?

Hi, we use Zoho Calendar with some calendars joined at same view.

When we use tool to create a unic view, we can join all calendar we have creted with Zoho Calendar, and calendar from Zoho Recruit... but we'll need to join calenda from Zoho Projects at same view generated with same "iframe".

If we don't have it, clients want to use this hours to them, but we are occuped with meetings created by Z Porjects.