How to bind several variables for different databases in a common query?

Question

Laravel

Good afternoon everyone,
I have a task to make a report based on the selection of several attributes
. And it turns out that all of them are directly tied to one database, but among them there is a search by floors that I can’t bind to the program in any way

//index
$level = [2,3,4,5,6];
 public function getReport(Request $request)
    { 
$start_date = $request->get('start_date', date('d.m.Y'));
        $date_end = $request->get('date_end', date('d.m.Y'));

       //$level_id = DB::select('select * from room where level_id = :level', ['level' > 1]); 
        $level_id = Room::where( 'level_id', '=', $request['level']+2)->select('number')->get();
        $habitation =  Habitation::with([ "places"])
        ->where('status','=','saselen')
        ->whereDate('dogovor_date','>=',$start_date)
        ->whereDate('dogovor_date','<=',$date_end)

        ->get();    
        
        return view('admin.admissionRep.report',compact('habitation', 'level_id', 'start_date','date_end'));
    }

while the program sees $level_id, but does not associate it with the program.

how can this be fixed?