autocde2.0/app/Http/Resources/API/PlanByAssetResource.php

<?php

namespace App\Http\Resources\API;

use Illuminate\Http\Request;
use Illuminate\Http\Resources\Json\JsonResource;

class PlanByAssetResource extends JsonResource
{
    /**
     * Transform the resource into an array.
     *
     * @return array<string, mixed>
     */
    public function toArray(Request $request): array
    {
        return [
            'id' => $this->id,
            'title' => $this->title,
            'asset_id' => $this->asset_id,
            'asset_name' => $this->asset ?  $this->asset->name : null,
            'begin' => $this->begin,
            'end' => $this->end,
            'display_id'=>$this->display_id,
        ];
    }
}