Multiple Database connection from Camunda

From camunda spring boot application I can connect to the DB which would be mentioned in
spring.datasource.url=

But if I want to connect to another schema along with this to store ,update or query some of the domain object as I don;t want the camunda schema to be overloaded with Db calls for application transaction purpose . How should I do that ?
Also Do you suggest to have a seperate Db/schema if I have a requirement to store some transnational data and query (high volume) ?

I also have same question, but looking for answers, please let me know if you got any way to do it. Thank you