Admin hooks for Exhibit Builder

Is there a hook for the exhibit builder exhibit add/edit form like there is "admin_collections_form" for Collections?

I'm writing a plugin that needs to add a few extra input fields to the Exhibit Builder add/edit exhibit form and then store those values in its own table along with the exhibit id.

The same goes for exhibit pages and their corresponding form.

Looks like we don't have those hooks in the current ExhibitBuilder.

A bespoke solution might be possible with a theme override of the forms to add the hooks.

Sounds like the way to go.
Currently I use a copy of the default admin theme under /omeka/admin/themes. Where should I add the hooks? Can you point me in the right direction?