Saving Custom Buttons

In Storyline, is it possible to create a custom button and save it within the program as a reusable button "theme"? Like, is there a type of "object library" where your custom buttons/shapes/objects can live and you can insert them whenever?

My current solution is to have a slide master that's just a button bank where I put all the custom buttons I created. I copy and paste them from there into the slides.  Just curious if there is a different (easier?) way of handling this within Storyline.

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