Laravel. How to combine a query into a model?

Question

Laravel

There is a model request:

$lat = (float) 55;
$lng = (float) 37;
$city = $lat.','$lng
$locations = Locality::where('point', $city)
            ->with('rating_results')
            ->firstOrFail();

And in this model, you need to immediately make another request:

$nearest = \DB::table('localities')->select(\DB::raw("*,
                            (6371 * ACOS(COS(RADIANS($lat))
                                * COS(RADIANS(latitude))
                                * COS(RADIANS($lng) - RADIANS(longitude))
                                + SIN(RADIANS($lat))
                                * SIN(RADIANS(latitude)))) AS distance")
    )->orderBy('distance', 'asc')->take(20)->get();

How to do it in one request?