Whats the best way to create a team shared calendar accessible on mobiles

Whats the best way to create a team shared calendar accessible on mobiles

Looking to move to Zoho - I like what I mostly see. But in Google, we have one team calendar than everyone has access to on desktop as well as mobile. I have created a few streams that have shared calendars accessible from the new Zoho Mail web app. But how can I get them to sync with the iPhone's default calendar? Using EAS, I only see one calendar that is synced. Even if I create a shared calendar under my personal calendars section, that also doesn't appear in EAS.