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

<?php

namespace App\Http\Resources\API;

use App\Models\User;
use Illuminate\Http\Request;
use Illuminate\Http\Resources\Json\JsonResource;

class ApprovalFlowDetailResource extends JsonResource
{
    /**
     * Transform the resource into an array.
     *
     * @return array<string, mixed>
     */
    public function toArray(Request $request): array
    {
        $nodeUsers = [];
        foreach ($this->nodes as $node) {
            $nodeUsers = [
                ...$nodeUsers,
                ...$node['approval_users'],
            ];
        }

        $users = User::query()->whereIn("id", $nodeUsers)->get()->keyBy("id");

        $nodes = [];
        foreach ($this->nodes as $node) {
            $userObjects = [];
            foreach ($node['approval_users'] as $userId) {
                //$userObjects[] = new UserProfileResource($users->get($userId));
                $userObjects[] = $userId;
            }

            $node['approval_users'] = $userObjects;

            $nodes[] = $node;
        }

        return [
            "id" => $this->id,
            "name" => $this->name,
            "type" => $this->type,
            "object_type" => $this->object_type,
            "object_id" => $this->object_id==0?null:$this->object_id,
            "nodes" => $nodes,
            "status" => $this->status,
            "created_by" => new UserProfileResource($this->createdBy),
            "created_at" => (string)$this->created_at,
            "updated_at" => (string)$this->updated_at,
        ];
    }
}