Apply entity query filter to user profile fields

[reallyquitetoby]

I am trying to filter on user profile fields. I am using the Profile module (https://www.drupal.org/project/profile) to store profile data on user accounts and need a way to filter by them. I have had success filtering by entity reference fields on the user entity by following examples on issue #573 whereby you specify a field name using snake_case and '.' to step into their entities e.g. {field:"roles.target_id", value:["member"]}. However as mainProfiles is not an entity reference field it won't seem to let me target it. mainProfiles does however autocomplete within GraphiQL explorer so is recognised and I can retrieve fields within it. I just can't seem to filter on those values. Does anyone have any ideas how I might get this to work?

Below is an example of what I am trying to do, ideally I would like to eventually target gender for example:

targeteduser: userQuery(filter: {conjunction:AND, conditions: [
      {field:"status", value:"1"},
      {field:"roles.target_id", value:["member"]},
      {field:"uid", value:"60"}
      # {field:"profiles.nid", value:"21"} // Internal server error if uncommented
      # {field:"field_profiles.nid", value:"21"} // Again does not work
      # {field:"field_profiles.target_id", value:"21"} // Again does not work
      # {field:"field_main_profiles.target_id", value:"21"} // Again does not work
    	]}) {
            count
            users: entities{
              ...on User{
                uuid
                uid
                entityType
                entityId
                roles {
                  targetId
                }
               profiles: mainProfiles {
                        targetId
                        entity{
                          entityId
                          changed
                          ...on ProfileMain{
                            fieldGender{
                              entity{
                                entityId
                                entityLabel
                              }
                            }
                          }
                        }
                      }
              }
            }
    }