How to change the Material parameters of the Composite through the Blueprint?

Hello, using the Composure Plugin in created the Comp Shot you can set your material in the Compositing Element Material Pass in the Transform / Compositing Passes section, and parameters of specified material will be available there in the Material Parameters section. These parameters can be changed by hand even in playback mode, but how can they be changed through a Blueprint?

I have not found direct access to these parameters in the Blueprint. Maybe I need to create a dynamic material and insert it into the Comp Shot, but you can only put simple material there?

One option is to use Material Parameter Collections, as described in one of the answers here: https://answers.unrealengine.com/questions/24913/view.html

Probably it is just to define a variable as Compositing Material type and then set the variable to the CompositingElementMaterialPass. I was able to execute this blueprint when starting to play.