How to filter data in a data expression

ChuckS

I'm new to using Data Expressions in Dashboards. I'm not sure if what I'm trying to do is simple or complex. My data expression is from a similar dashboard from a colleague.

I'm creating a Table dashboard element that uses a data expression. Currently, I only have 5 records in my feature layer. Elsewhere in the dashboard, I have 3 Category Selectors which have Actions that filter data displayed in my Table element. The default selection for the Category Selectors would only display 3 records in the Table.

When I use FeatureSetByPortalItem in the data expression for the Table (shown below), it gets ALL records from the feature layer. How do I access only the records which are filtered by the Category Selectors? I'm iterating through the records to get the most recent record for a specific value in a field, but the result is a record which is not displayed (based on the Category Selectors).

var originalLayer = FeatureSetByPortalItem(
  Portal('https://arcgis.com/'), 
  myFeatureLayerID,
  0
);