Typekit is a subscription service for fonts which you can sync to your computer or use on a website. Instead of licensing individual fonts, you can sign up for the plan with adobe and have access to the fonts as long as your account remains active. If you choose to cancel your plan, the fonts will no longer be synced or served on your website. For this reason, InDesign does not allow you to package or download TypeKit fonts.
Because you cannot download the TypeKit font they are not available to upload to the template asset area of your template, and because InDesign will not package them, they are not available when you create your template via the InDesign plugin.