I am trying to figure out how to filter data in mongodb Atlas via API requests. My json structure:

{
_id: ObjectId,
level: number,
names: Array
}

I learned how to filter by _id. I pass the id via url, and fetch data with filter parameter using $oid in the body.

But the question is: how to filter data by level and get the list of data assign to certain level? I don't know what to use instead of $oid