Starting games in PPSSPP from another app

[freelancer]

I'm the developer for an emulator frontend (ARC Browser) available for Android TV. Basically my app indexes all your roms and launches emulators when you wanna play a game. Unfortunately I'm having trouble integrating it with PPSSPP. Information I've found suggests that I should be able to launch an intent for org.ppsspp.ppsspp/.PpssppActivity with an extra called org.ppsspp.ppsspp.Shortcuts containing the path to the ISO, but it just doesn't work. When I do, I just get to the PPSSPP "start" screen, no game loaded.

Does anyone know how I could accomplish this? Is it not supported anymore? Is it not supported on Android TV?

Sent an e-mail to the developer, but I haven't heard back yet.