Fundamental Chart Spread Normalized Data

I think this is similar to https://ycharts.useresponse.com/topic/spread-normalized-data-in-fundamental-chart but different.

If a user is looking at normalized total returns of two securities and wants to then chart the spread in those normalized returns, the spread displayed is the spread of the non-normalized (Original/unchanged) metric.

Ex. Showing normalized total return price of SPY and IJR for 6M range, the spread is something like 2-3% on average eyeballing the graph. However, using the Ratios/Spreads/Correlations option to show the spread right below that only gives you the ability to show the spread of the non-normalized numbers, which averages something like $230 and is not useful.

Idea: Ability to perform Ratios/spreads/Correlations on normalized numbers in Fundamental Charts