How to query graphene.ObjectType

**Is your feature request related to a problem? Please describe.**
In [DOC](https://docs.graphene-python.org/projects/django/en/latest/queries/#related-models), there says:
`Then all query-able related models must be defined as DjangoObjectType subclass, or they will fail to show if you are trying to query those relation fields.`

**Describe the solution you'd like**
I'm using djongo, and there's `ObjectIdField` that `Don't know how to convert the Django field tasks.Mtask._id ()`.

If I use graphene.ObjectType, then `they will fail to show` as the DOC says.
```
class MtaskType(graphene.ObjectType):
_id = graphene.ID()
name= graphene.String()
```

I want graphene.ObjectType to show. How can I do that? Thanks.