Link Property Control to Expressions like in Calculated Values

There are numerous uses cases where being able to reference an expression against a data table would be useful as a property control. This could be used for doing a sum/min/max/uniqueconcatenate/etc for use in Visualization Titles, Lines & Curves, other Expressions, Calculated Columns, etc

It would be nice to be able to define a Property Control similar to how we define a Calculated Value in a text area (pick a data table, set the expression, determine which filters/markings to apply, etc). This value could then be used as a literal anywhere within the tool. This would avoid a lot of complicated JS or iron python coding and "tricks" which are required today to do this. Also, this should support the ability to associate script actions when the value changes based on marking/filtering changes.