I was checking the event-grid-subscription to find a property which is likely to be a boolean type that I can see in the portal below Enable Advanced Filtering on arrays
However I couldn't find the exact property in the tf docs.
Am I missing any properties here or the tf module itself doesn't have these features yet?
The property EnableAdvancedFilteringOnArrays is supported on API versions newer than 2020-10-15-preview, so you should use the restapi provider in the terraform to handle the new features of the AEG advanced filtering.
Have a look at more details for Event Subscriptions - Update using the REST API.