Invoke REST API (Lambda) from Quicksight custom action. Is it possible?

[ErikG]

Hi @vkhilari
yes it is possible.
Please check:

Perform secure database write-backs with Amazon Quick Sight

Amazon Quick Sight is a scalable, serverless, machine learning (ML)-powered business intelligence (BI) solution that makes it easy to connect to your data, create interactive dashboards, get access to ML-enabled insights, and share visuals and dashboards with tens of thousands of internal and external users, either within Quick Sight itself or embedded into any application. A write-back is the ability to update a data mart, data warehouse, or any other database backend from within BI dashboard…

Maybe different use case but same approach.
BR