Save date from Google Calendar to helper

Hello everyone,

I would like to save the date from my Google calendar into a helper so that I can then display it in my dashboard.
Example: If I did exercise (running) on 04.02.2024, I will enter it in my calendar.
When I look at my dashboard, I always want to see when I last did any type of exercise.
Unfortunately I can’t get the date transferred to the helper.
I have 2 helpers (sport_running and sport_dumbbells) that I want to fill automatically (or differently if possible).
Both helpers are of type Date.

Can someone help me?

Here is the yaml of my automation:

Thank you very much
Ralph