Sure. Here's a TOS chart of Friday Aug 16 RTH.
View attachment 207334
The spread is weighted Long 2 NQU9 and short 3 YMU9. ES is in blue and the spread is in white. ES values on left and the cash value (notional) of the spread is on the right. Lower chart is detrended against the red line. The red line is a polynomial regression on the spread.
I'm still building these systems so its a work in progress. Look at the range on the right side. Seems tradable to me. As for correlation, you can see that visually.