Preview and Destination Total Sum line & Filters#1828

Would really be great to have a sum total lin e at the top of the preview to simplify and double check the data to a total. As an example - Pulling google ads spend and clicks by day for a month - but having a total line at the top would be great for a fast check and QA to platform metrics to confirm that my data matches what Im seeing in polatform or if there are paused or hidden elements that may be affecting the data.
This leads to the second request - adding the ability to filter a metric or dimension. If I want my output to be multiple data sources (Google Ads, Facebook ads, etc) all in a single export destination, I have to build them into one data set, but having the ability to filter only to one sorce to check and QA the data would be super beneficial.

I can see several use cases for filtered fields “Campaign name contains… “ to then create a custom dimension to identify marketing objectives at a lower level, but also having the filter to QA and check when any custom filter is not working. The ability to fast filter helps identify data quality issues fast, and create additional fixes rapidly.