Create a entity “View” and link it with the main entity with one to many associations and use it in the data view instead of the main entity.
Also, create a microflow and in that microflow filter the list and then create a view object and link the object with the filtered list. Then, on each filter’s on click event call that microflow.
Now, in the select microflow you will have the view object linked with the only filtered list.
Also, put the data grid-2 inside the data view so that the view object will be available in the filter’s microflow and from that object you can filter the list. In the data grid-2 use the associations as a source of the data.