How to add extra pivot table attributes to the team_users table

Spark uses a pivot table called team_users that has the following columns:

team_id, user_id, role

I have added a fourth column called "active".

I can access the user's role on their current team like this:

Auth::user()->current_team->pivot->role

What do I need to do to access the "active" column in the same way?

Like this:

Auth::user()->current_team->pivot->active

I'm assuming there is a belongsToMany relationship where I need to add extra attributes like this but I can't find it:

->withPivot('active')