How to execute a function during widget animation

[mattai (matt)]

The previously posted link is broken, but I believe this is the working version in case anyone else lands here.

Can you animate a dynamic material parameter in UMG widget timeline?

So in the graph of my widget I can create a dynamic material instance. I can then use “Set scalar parameter value” to change a parameter on it in blueprints. I’d like to be able to change this parameter on the timeline so the designer can edit fade in times etc but do not see a way to select it. Is this possible or am I limited to linear onframe changing?