Sum Existing Indicators within a Dashboard

[TBannister]

I have a dashboard with 3 indicators that update as user pans the linked map. The first 2 indicators are linked to a feature layer, and the 3rd indicator is linked to different feature layer. The data is delivered to me in 2 separate feature layers and are updated frequently and each indicator has unique filtering. I wish to have a 4th indicator that sums the values of Indicator1 + Indicator2 + Indicator3.  I have been trying with arcade in a data expression but am not having any luck; I can get the summation of indicators, but I am not able to get it to be dynamic and update on the fly as the user pans the map. I believe this was once functionality that was possible but has since been removed based on this thread: Solved: Find Sum of Existing Indicators within Dashboard u... - Esri Community. 

[Neal_t_k]

@TBannister Since indicator 1 and 2 are coming from the same layer, Is it possible to filter the data so you can get the sum of Indicator 1 and Indicator 2 in one expression using an OR filter?  If you can, you may be able to use the reference option to pull in the 2nd layer into the same indicator and filter that to get the sum of  Indicator 3, then using advanced formatting, sum the datapoint and reference to get the sum of all three.   

This may only work if your or filter doesn't return any overlapping data...