Synchronising Google Calendar without GMX mail account?

I have coupled my Google ID (which includes Notes and Calendar) not to a Google / GMX-account but to a mail-account from some other supplier.

So far I have only found the option to couple the eM-Client calendar with the Google calendar through a GMX mail account.

Is there any possibility to synchronize the eM calendar with my Google calendar without creating a new GMX mail account and moving all my calendar and notes entries to that GMX account?
I would prefer not to have an additional GMX account just for this task…

Thanks in advance!
Tom

To add your Google Calendar, go to Menu > Accounts and add a new account.

Choose Calendar > Google Calendar.

Thanks Gary!
This worked after a lot of fiddling with the “Google wants this” and “Google wants that”.

Best regards
Tom