Example video
We have set up a service to connect your Google Sheet as a data source.
Add a new data source in DynamicScreen :

Select "Google Sheets" :

Two choices are available :
Add from URL = Share your Sheets with [email protected] and copy/paste the url.
Add from Google Drive = Sign in to your Google account and retrieve your Sheets from Google Drive.

Click Create.
Your data source will now update regularly from your Google Sheet.