How to add a custom visitor variable?

How to add a custom visitor variable?

We are trying to deploy salesiq codeless bot builder on our web app. Users will have to login to access the chatbot. 

When the access the chatbot, since we have already authenticated the user, we want to pass some information like authToken, customerId, etc in the background. We want to use this information as input to some plugs to fetch some information from the application database. 

We are able to send this information to CRM, this information is also available as custom info on salesIq Dashboard. 
Zoho Team mentioned this is not possible right now. Has anyone been able to create a custom visitor variable without taking an input explicitly?