Maybe a new functionality for the future: To show in the root theme information about the sub sites

Sharing
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Create global post feeds, make all the content across your network fully searchable, use global tags – Post Indexer eliminates limitations created by individual site tables.

https://premium.wpmudev.org/project/post-indexer/?utm_expid=3606929-97.J2zL7V7mQbSNQDPrXwvBgQ.0&utm_referrer=https%3A%2F%2Fpremium.wpmudev.org%2Fproject%2Fuser-reports%2F