The Valist Subgraph indexes multiple Valist contracts and consolidates it into a simple GraphQL interface.
You can find the deployed Polygon Mainnet subgraph here:
You can find the deployed Polygon Mumbai subgraph here:
The source code for the Valist Subgraph can be found here, which contains everything you need to get started:
For this, you will need to deploy your own graph node. Here's a docker-compose file that can help get you started -- however please note this is not secure out of the box, you will need to configure your database and networking/firewall properly.