如何在请求数组中插入静态字段（Laravel 5.7）

我在店铺功能的某个小特性上遇到了问题，似乎在互联网上没有找到适合我的合适答案。\n我想在数组请求中添加静态数据，这样当发送数据时，枢轴表中的字段将自动填充为某个整数。\n我有以下表格：\n

Schema::create('mounter_evaluations', function (Blueprint $table) {
    $table->increments('id');
    $table->integer('project_id')->index()->unsigned()->nullable();
    $table->text('mentions')->nullable();
    $table->softDeletes();
    $table->timestamps();
});  
Schema::create('mounter_procedures', function (Blueprint $table) {
    $table->increments('id');
    $table->integer('mounter_norm_id')->index()->unsigned()->nullable();
    $table->string('detail');
    $table->softDeletes();
    $table->timestamps();
});
Schema::create('mounter_procedures_checks', function (Blueprint $table) {
    $table->increments('id');
    $table->integer('mounter_evaluation_id')->unsinged()->nullable()->index();
    $table->integer('mounter_procedure_id')->unsinged()->nullable()->index();
    $table->integer('checked')->unsinged()->nullable();
    $table->timestamps();
});

\n以下是我的模型：\n

public function mounterevaluation() {
    return $this->belongsToMany(
        'App\MounterEvaluation',
        'mounter_procedures_checks',
        'mounter_evaluation_id',
        'mounter_procedure_id'
    )->withPivot(['checked']);
}
public function mounterprocedures() {
    return $this->belongsToMany(
        'App\MounterProcedures',
        'mounter_procedures_checks',
        'mounter_evaluation_id',
        'mounter_procedure_id'
    )->withPivot(['checked']);
}

\n这是我的存储函数：\n

public function store(Request $request, $idProiect) {
    $evaluation = MounterEvaluation::where('project_id', $idProiect)->first();
    if (!$evaluation) {
        $evaluation = new MounterEvaluation();
        $evaluation->project_id = $idProiect;
    }
    $evaluation->mentions = $request->mentions;
    $evaluation->save();
    // $request->request->add(['checked' => 1]);
    // $evaluation->mounterprocedures()->sync($request->procedures);
    // $evaluation->mounterprocedures()->sync($request->all() + ['checked' => 1]);
    $evaluation->mounterprocedures()->sync($request->procedures);
    // $request->request->add(['checked' => 1]);
    $evaluation->mounterprocedures()->request->add(['checked' => 1]);
    return response()->json($evaluation, 201);
}

\n每次有人在评估表单中勾选某个字段时，这个勾选将存储在枢轴表中。