Sum relationship

I have a User model and a Course model. with a relationship between them, this relationship is defined as "enrollment" (enrollment is basically the pivot table of the relationship)

I have made a filament resource for enrollments.

I want to get the sum of the costs of all courses

If I use the default

Sum

Sum

, I get the unique sum like so:

enrollments table:
id | user_id | course_id|
1  | 1       | 32       |
2  | 1       | 36       |
3  | 2       | 32       |

enrollments table:
id | user_id | course_id|
1  | 1       | 32       |
2  | 1       | 36       |
3  | 2       | 32       |

this currently returns the following

cost of course 32 + cost of course 36

cost of course 32 + cost of course 36

.

but what I want is to return

cost of course 32 + cost of course 36 + cost of course 32

cost of course 32 + cost of course 36 + cost of course 32