Authentication & Token Management with @nestjs-shopify/auth

I’m working on a project using NestJS with @nestjs-shopify/auth": "^6.0.0" for Shopify authentication.

Is there a way to let merchants who installed my app previously continue using their existing token with the old scopes, while only new installations generate and use a new token with updated scopes?

In other words, can I maintain backward compatibility for existing merchants while enforcing new scopes for fresh installs? If so, what’s the recommended approach to implement this in NestJS with @nestjs-shopify/auth?