How to use Supabase DB Functions in Javascript Client API using Select Query?

My Goal is to get the coordinates in human readable form without using a seperate request as follows.

supabase.rpc('fn')

I have a table named live_route and it is linked to an other table named profile. I want to get the data of profile and live_route. Table Relations are Profile => Shifts => Locations => Live_route

From below Code You will understand the relations more clearly and how I want to run the function.

   const { data, error } = await supabase
.from('profiles')
.select(`
      id,
      first_name,
      last_name,
      status,
      role,
      profile_image_url,
      phone,
      created_at,
      rating,
      experience,
      user_id,
      email,
      availability,
      last_sign_in_at,
      shifts (
      *,
        location:locations (
          *
        ),
        live_location: live_route(
        coordinates,
        lng_lat: lng_lat_conversion(coordinates)
        )
      ),
      ...organizations(
        organization_name: name
      ), certificates(name)
      `)
.eq('id', id)
.single();

Currently I am getting following error

Relation between Profile and lng_lat_conversion not found.

Please guide how I can achieve my goal of sending a signle request without using rpc.