Custom rest fields not loaded in rest api cpt response

I’ve ended up with a simple solution. after the query to the DB to get all the desired CPT I’m looping the posts object and inside my loop I get the postmeta I will need to add and append them to each post before return the data to the front-end

    public function get_contents( WP_REST_Request $request )
    {
        if( !wp_verify_nonce( sanitize_text_field( $request->get_header( 'X-WP-Nonce' ) ), 'wp_rest' ) ){
            return new WP_Error(  
                'expired_or_invalid_nonce',
                __( 'Nonce expired or invalid.' ),
                array(
                    'status' => 403
                )
            );
        }
        $post_type = sanitize_text_field( $request->get_param( 'post_type' ) );

        $q = new WP_Query( 
            array(
                'post_type' => $post_type,
                'posts_per_page' => -1
            ) 
        );
        
        $posts = array();
        //
        foreach( $q->posts as $p ){
            $post_meta = get_post_meta( $p->ID );
            if( $post_meta ){
                $p->post_meta = $post_meta;
            }
            array_push( $posts, $p );
        }
        //
        return new WP_REST_Response( $posts, 200 ); 
    }