What the title says....
Hi Suzie, welcome to the community!
I believe you are referring to the Trello Planner? If so, the Trello planner can connect to your Google Calendar, and you can view the Google tasks in your Planner; however, it's not a two-way sync. You can also view the focus time you add to your Trello planner on your Google Calendar.
You can check for information here: https://support.atlassian.com/trello/docs/trello-planner/
IF you are referring to the Calendar Power-up, it's also a one way sync, where you can view your cards due dates over your Google calendar using a iCal feed: https://support.atlassian.com/trello/docs/using-the-calendar-power-up/
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