Change roadmap visibility of milestones via workflow

Hi,

Background:

we are currently using milestones in 2 ways in our projects. on the one hand they represent sprints of agile teams and on the other hand, they also represent milestones of the project.

Problem:

Currently, we have to manually set the sprints as "Hide from Roadmap" and I would like to be able to set this automatically by using a custom action to create new sprints and or by using templates. However, I'm not able to set the roadmap visibility either in a custom action or by using a milestone template that has been set as "Hide from roadmap".

Is this currently just not possible to do?