How to create user filters for a read-only grid with expression variable as data source

Hello all!

I am creating a portal for Appian Europe Live Build Challenge 2022. In this task among others I am showing on my interface a read-only grid with scheduled World Cup matches. 

Since I need to use Appian Portal, I cannot use record type and my data source for the read-only grid component is a (local) variable that contains list of Dictionary data I got from previously created API and Integration.

The question is: How to create user filters that allow to dynamically filter rows in a read-only grid component?  In my case, a user would enter my Portal website and filter matches by coutry or group.

Thanks in advance!


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