What is the proposed idea/solution?

To use other Number elements on the page as a source for a Number element

How does it solve user problems?

Number element, by itself, can use one table as a source. Still, if I have multiple Number elements using different tables as a source, it would be helpful to get the sum (or other summary types) of other elements, so there's a grand total of some sort.

How was this validated?

The same idea as how Number elements work, but using other elements as a source rather than a table.

Who is the target audience?

Those who use the Dashboard template on the Interface Designer.