Help needed with two visuals and / or DAX

Hello everyone,

I can't figure this out by myself, so all the help is appreciated. I pull data from a BMS system (building management) and get historical values. There is a datetime column, datapoint column and value column.

What I want to present is to present two values in a line chart over time (setpoint, and currentvalue), so far so good and nothing special. The second thing I want two present is the difference (%) (average) for the chosen values.

The point is that I need to keep it simple, so people need to use the filterpane to filter datetime and choose two datpoints for showing the values over time, and showing the difference (%) average as kind of a score.

Filtering both (as two sperate visuals) is not the problem, but it would be nice if it's possible when people use the filterpane for filtering the "over time" visual that the score visual is even filtering directly. Is there a way to acomplish this? Below as an example what I need. (although four times on one page). The percentage value must be filtered by the line visual, and the line chart must be filtered by the pilterpane.

All data used for this example is included in the download.

Any help and all kind of (other) solutions is absolute appreciated, kind regards Martin

https://www.dropbox.com/scl/fo/5z9hcww2frknbjbar62ax/h?rlkey=1ymj9ov8f8vt5lmrti19mmxor&dl=0