Thanks for getting back to this thread and adding a clarification, @iwidjaja.

For now, importing certain fields on your existing invoice templates is unavailable in QuickBooks Desktop (QBDT). As mentioned above, you can't include any information in your sales template since QuickBooks uses a default mapping on its fields.

However, you can look for a third-party app that can help you import custom templates for your invoices. Here's the link: https://desktop.apps.com/home.

I can see how this option would be helpful for you and your business. Therefore, let me take note of this as a suggestion to improve your QuickBooks experience.

You can also visit our Firm of the Future site. This is where we share recent happenings and future developments, such as updates to newly added features. 

Just tag my name in the comment section if you have any other concerns or questions. I'll get back to you as soon as I can. Stay safe.