def METHOD_NAME(
    self, instances: Sequence[Organization], key: str
) -> Mapping[Organization, Any]:
    instance_map = {i.id: i for i in instances}
    queryset = self.filter(organization__in=instances, key=key)
    result = {i: None for i in instances}
    for obj in queryset:
        result[instance_map[obj.organization_id]] = obj.value
    return result