How can I properly add a link to the header in my DeepLink extension?

I am making an extension and deeplink .
This is my deeplink

f'https://{shop_name}/admin/themes/current/editor?context=apps&template=product&activateAppId={MIX_APP_ID}&Header:header'

Question 1: I want to add a link to the headers but in my deeplink it says template=product. Should i need to put template=header but in docs it says there is no template=header

Question 2: I want to add link in header through my extension but it automatically add it in icon section of header . Why is that ? I want to put it after links in headers. How to do it

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