Great choice with the Nest Hub 2!
What you'll need to try is to make sure the Nest Hub is coming up in your Home app (ensure the Google account is signed in)
In the Google Calendar App:
create a new "Reminder"
Where it says "Remind me to..." put i.e. Take Medication
Choose a date
Where it says "Does not Repeat" choose a repetition for example "Every Day"
You can then set multiple daily, weekly, monthly reminders using the same process.
(Make sure the correct Google account is signed in on both devices and that sharing permissions are active)
I hope this helps!