The Nash exchange is currently listed among all of the available wallets/exchanges on Koinly, but it only offers a manual-import option. However, it appears that API integration is possible, and Nash even has a dedicated repository for it on GitHub at the following link: GitHub - nash-io/api-client-typescript: Official TypeScript client for interacting with the Nash Exchange.
Please kindly consider adding API support for this - relatively new/small, but nevertheless very promising - exchange!