How to save a Team Home site as a template to use in future Teams?

Our Marketing Team has a Team inside Microsoft Teams (Team A)

In Team A, they created a Home tab.

Using "Open in SharePoint" they amended the content of the Home site to include all the structure they need. They want to use that Home site structure as a template for when they create new Teams.

So, they will create a new Team and then hope to insert a Home tab that already has the Team A structure ready to go.

Is this possible without creating a Team Template? 

The only thing they want to recreate is the Home Tab content, not the Teams Channels or file structures etc. 

I hope this makes sense.

Thank you