At this moment (sept 2021) it's not possible to configure, applying a OneNote, Planner, etc. to these tabs without users interaction, the (built-in and custom) added Teams tabs via Graph calls.
We can apply a tenant template with a script and graph calls where we can create both a Teams with the different tabs, but it is missing to do the tab configuration via Graph. This is a bad user experience because these Graph-added tabs will need to be configured by the channels' users on their first use.
Request: can you also make the configuration (applying a OneNote, Planner, etc. to these tabs without users interaction) of the tabs by Graph calls?