Input CSV to Existing Table

I am exploring the new feature of Uploading CSV to Metabase to create a table in Postgres backend.
I want to know if there is any option to insert CSV to existing table present in the Metabase collection.

Seems not possible but I will love it !

All from the frontend? Or you have access to the database?

From the Frontend. So that Non-Tech users will be able to update Mutiple records