Definite spins up a datalake for you and pipelines to get data into the lake. We also have BI (semantic layer + dashboards) and an AI agent that will build reports for you. Let me know if you need a hand getting set up! I'm mike@definite.app.
Are your dashboards for an internal use-case? If so, there are some excellent AI-Native BI tools out there that have connections for Google Sheets.
Looks like you got some good suggestions for how to solve your particular problem with sheets in the other comments but feel free to check us out again if you ever move to something like Postgres/MySQL.
In particular, Metabase and Superset can be deployed with DuckDB support. You mentioned customer facing dashboards, note that Metabase embedded is not free. Just to say, our SeekTable also has DuckDB connector (and can be used as an embedded BI).