GtmDataLayer
【GTM 追跡学】dataLayer とは何か？最も詳細な解説
https://www.maxlist.xyz/2023/06/01/gtm-datalayer/
Data Layer Variable in Google Tag Manager: How to Pull Important Data
https://measureschool.com/data-layer-variable/
Network API 呼び出し場所の確認
Network Intiator
