Trying to create editor-style to have visual editor show theme fonts

As title states, I’m trying to get the TinyMCE editor to show the theme fonts by creating an editor-style.css; however it doesn’t seem to be working for some reason.

Would you be willing to include this with a future update or help me set this up so that editor matches theme fonts? It’s very important for some of my customers to see how their posts will look while they are typing.

Visual Composer is one way we could possibly do this, but I’d prefer to not have to enable Visual Composer on blog posts.

Thanks!