Is there a way to prevent users in a particular role from creating a menu link for a node above a certain level in the menu hierarchy?

The main menu on my site has 2 tiers:
- Top tier - Links here appear in the main navigation bar on the site
-- Second tier - Links here appear as dropdowns beneath their parent items

There is also a role for content authors, for users who are allowed to create nodes.

I would like content authors to be able to add a link to their nodes into the second tier of the menu, but not the first. I.e. They should be able to add items to the menu dropdowns, but not the main menu itself.

Is there a way to achieve this with Drupal 8 or with any contributed modules? I've been unable to find an answer in my Google searches so far.