It is possible now by using MobiFlight WASM and FSUIPC with custom events as listed here: https://github.com/Working-Title-MSFS-Mods/fspackages/wiki/Sim-Variables
You just need to copy MobiFlight WASM module to community folder. Add to "events.txt" file required HVAR from the above link and also add them to custom cj4.evt file in FSUIPC folder - https://forum.simflight.com/topic/91738-new-mobiflight-wasm-events/. Working very good for me