Staging version of Arduino for STM32

Is it possible to use staging version of Arduino for STM32 just like for ESP8266 (as described in Espressif 8266 — PlatformIO latest documentation)?

What if I edit platform.json in platform-ststm32 manually and set the version of Arduino framework to git repository? Is it enough? Will I get updates when the upstream is updated?

Please file a feature request here Issues · platformio/platform-ststm32 · GitHub