Quick Answer (TL;DR)
To create a PE-TM mapping chain on the Jio DLT portal, log in and go to My Telemarketer > My SMS Telemarketer. Click New Chain, search for Telemarketer ID 1702157373640103575 (SMSINDIAHUB), select it, and click Create. After TM approval, submit a final request on the DLT panel to complete the process.