A new QGIS plugin has been released:
Name: Chandrayaan-2 IIRS, https://plugins.qgis.org/plugins/thermal/
Details of the plugin can be found at https://github.com/prabhakaralok/CH2IIRS
This plugin generates Level 2 reflectance data from radiance data of Imaging Infrared Spectrometer sensor of Chandrayaan 2