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Hi @akghoshal . Doesn't look like TPG is going to answer your question.
If you look at TP-Link website for VX220, there is no mention of Mesh, no user guide is provided, and only GPL source code (not firmware). This is in line with concept of providing this model to ISPs to customise the firmware, as TPG has done for the VOIP function. As they have also done to remove certain other functions.
For the VX230, it supports EasyMesh, the Support section has a user manual, and firmware.
Download the VX230 user manual and read the section on EasyMesh. See if your VX220 has anything like it.
Hi @akghoshal
The TPG provided modem/router is not Mesh ready, but you can connect a mesh or any access points to it manually via WiFi or WPS.