Dear @RachitC 

To include data from related lists in your Flow Designer action, you might need to use a script to query and retrieve the related data before sending it through the Salesforce Spoke. Make sure the fields and relationships are properly accessible in your setup.

If you find the Salesforce Spoke too limited for your needs, you could consider a solution like Exalate, which allows more customization and supports advanced use cases, including handling related lists in integrations.