Hi,
We normally support the toolchains that are available as stable releases from Espressif. I.e. once a toolchain is available via the ESP-IDF tool installer, we recheck it on our side, make sure that the VisualGDB GUI is fully compatible with it, bundle it with the matching ESP-IDF version that we tested, and re-release it as a ready-to-use VisualGDB package.
Currently, the latest ESP-IDF installer (v2.10) still installs the esp-2020r3-8.4.0 toolchain, that matches our latest toolchain (esp32-gcc8.4.0-r3.exe).
Once the new toolchain is released by Espressif as a stable binary package, and is made available via the ESP-IDF installer, feel free to get back to us, and we will give you a timeframe on repackaging it as a VisualGDB package.
If you would like to experiment with pre-release versions of the toolchains, you can do it by simply building them manually and replacing the binaries inside c:\SysGCC\esp32 (the versions and paths are stored in the Toolchain.xml file), however it is something to do at your own risk.