Viva Engage Notifications

We would like to understand whether Viva Engage supports any of the following capabilities:

1. Automatically enabling email notifications for new members when they join a community.
2. Configuring community members to receive notifications by default and requiring them to opt out rather than opt in.
3. Applying a tenant-wide or community-level policy that enables email notifications for all members of selected communities.
4. Configuring notification settings through Microsoft 365 admin settings, Viva Engage admin settings, PowerShell, Microsoft Graph, or any other administrative mechanism.
5. Identifying whether this functionality is on the Microsoft roadmap if it is not currently available.

Our company is currently test piloting Viva Engage with a few different departments, but they are noticing that member engagement is not very high.  We are looking for ways to get members more engaged in the product.  

Thanks,

Greg