Custom user data - creating a dictionary property

MongoDB Atlas App Services & Realm Atlas Device Sync
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Reposting as I didn’t get a reply on the last post.
I want to store a Dictionary in my Custom User Data object for realm sync, something like the following:

[BsonDiscriminator("app_user_data")]
public class AppUserData
{
    [BsonElement("user_permissions")]
    public Dictionary<string, UserPermissionObject> UserPermissions { get; }
}

Where UserPermissionObject is just a regular object with a couple of properties.

Is this possible, and if so how would it be implemented in the mongoDb side and how could I insert a dictionary into an entry programatically (i.e. using a .NET application or the Realm UI) if required?