Can you use Custom Connectors to pass different Facebook Page Access Tokens?

I created a chatbot using Rasa Open Source and I’ve integrated it with one of my Facebook Pages. However, I also want to use the same chatbot with my other Facebook Page since it will most likely be responding to similar questions. Since I own the two pages, they can have the same callback URL for the webhook. However, each Facebook Page has a different access token and Rasa only allows one in the credentials.yml.

I’ve seen an answer wherein custom connectors can be used to do this but I’ve only seen an example that passes a webhook, not an access token. Has anyone tried doing this?