Changing the backoffice collection toolbar (adding additional filters)

I would love the ability to add other filters to a collection. For example, if my documents have a status dropdown value, I would like to be able to filter by status in the collection view.

However, I have no idea where to start with this. I’ve looked through the documentation and scoured the github for a sign that it is possible, but I’m not coming up with anything. The only thing I’ve been able to find is that there is a file here showing the document collection element and it renders the collection toolbar. But I’m not seeing a way to edit what is in the toolbar or add filters.

I also found this context file, but do I have to create my own context with a custom filter model? I’m just not quite sure where to go from here.