This looks interesting. More like a conjunction of notion and metabase, I often use metabase and always want to write and share posts with synced data charts. Tellery looks like a solution for this. Will give it a shot.
Analysts operate in isolated workflow: write a SQL, snapshot it, then sync it using Notion and start over. We usually call this workflow "ad-hoc" analytics. And if I create a metric in a dashboard, it makes no chance to reuse it. Tellery tries to ease the process.