How to combine Meta.fields dict and list

[podplatnikm]

Hello, I ran into a bit of a problem with my project (use Django and DRF). My problem or question is, how can you simultaneously use auto-generated filters with those you define manually - how can I define both in Meta.fields field.
Example:

class EventFilter(filters.FilterSet):
    occurrences__gte = filters.BooleanFilter(method='get_event_occurrences_gte', label='Occurrences greater or equal')

    class Meta:
        model = Event
        fields = {
            "conference_room": ("in",),
            "category": ("in",),
        }

In the example, I use default auto-generated filters for fields 'conference_room' and 'category'. Since this is a dict, I don't really know how I can add an 'occurrences__gte' to fields. If it was a list, this would be a trivial task.

Do I have to manually define the conference_room__in and category__in filters? If that is so, what filter do I use? CharFilter ?