Laravel One to Many and Many to Many for the same Model

Question

I am trying to make a task management system. Users can create a task and assign multiple users to the task. So the task table will have a user_id for identifying the user who created the task. There is a pivot table that consists of user_id and task_id so that the assignees of the task can be mapped there.

tasks table details

Schema::create('tasks', function (Blueprint $table) {
        $table->bigIncrements('id');
        $table->string('title');
        $table->text('content');
        $table->Integer('views');
        $table->foreignId('user_id')->constrained()->onDelete('cascade')->onUpdate('cascade');
        $table->timestamps();
    });

users table structure

Schema::create('users', function (Blueprint $table) {
        $table->id();
        $table->string('name');
        $table->string('email')->unique();
        $table->timestamp('email_verified_at')->nullable();
        $table->string('password');
        $table->rememberToken();
        $table->timestamps();
    });

pivot table task_user structure

Schema::create('task_user', function (Blueprint $table) {
        $table->bigIncrements('id');
        $table->foreignId('task_id')->constrained()->onDelete('cascade')->onUpdate('cascade');
        $table->foreignId('user_id')->constrained()->onDelete('cascade')->onUpdate('cascade');
        $table->string('status')->default('TODO');
        $table->timestamps();
    });

Task model has this

public function users()
{
    return $this->belongsToMany('App\User');
}

User model has this

public function tasks()
{
    return $this->belongsToMany('App\Task');
}

Now I have a Task Resource with data fetching from UserResource but I am only able to get the data from a pivot table.

return [
        'id' => $this->id,
        'title' => $this->title,
        'content' => $this->content,
        'views' => $this->views,
        'user' => UserResource::collection($this->whenLoaded('users')),
        'comments' => CommentResource::collection($this->whenLoaded('comments')),
        'assingnees' => $this->whenPivotLoaded('users', function () {
            return $this->users->pluck('pivot.user_id')->unique()->all();
        }),
        'created_at' => $this->created_at,
        'updated_at' => $this->updated_at,
    ];

I want the user details from the pivot table in assignees and the user details from the tasks table in user. But eventually, I ended up getting pivot table users in user, and no assignees variable is obtained in JSON response. How can I get both user data in separate variables?