Thanks for your answer.
I didn't test you option yet, first I'm testing the ADMX Chrome policies for block only the Chrome notifications.
Here is the OMA-URI that I'm testing:
Name: DefaultNotificationsSetting
OMA-URI:
./Device/Vendor/MSFT/Policy/Config/Chrome~Policy~googlechrome~ContentSettings/DefaultNotificationsSetting
Data type: String
Value:
<enabled/>
<data id="DefaultNotificationsSetting" value="2"/>
I'll feedback here! thanks!