Hi Dhruv, Superset dashboards cannot be imported into Imply Polaris as Imply has its own proprietary format for visualisations. I think these would be your options if you choose to move from OS Druid to Imply Polaris:
1. If you have a small number of visualisations, you can recreate them in Polaris over a period of time by referring to your existing visualisations in Superset.
2. Continue to use Superset as your BI tool by connecting it with Polaris using API key.
Steps can be found here.