Having bought the new Google Home Hub, I would like to sync (or export) birthday events from my Facebook account to Google calendar.

I have googled the process and found some information where it says you go to events in Facebook using Chrome. On this page there should be an option to export it.
This is definitely not there, so I cannot export it. I have also tried right clicking and copying the link and adding it to the calendar which also don't work.
Finally I have searched the help on Facebook where it says this feature is currently unavailable.

Has anyone done this successfully or is it really not doable?