Export WebM VP9 with a transparent background included

Hi there,

Is it possible to export a WebM video in VP9 with a transparent background from AME?
I have tried a few things and can't seem to get the alpha channel included in the export. 

AME Version:  22.4 (Build 53) on Windows 10 

Methods i have tried: 

• Importing PNG sequence and export Webm VP9 - exports webm but no alpha channel
• Converting MOV to webm vp9 - same result, exports but no alpha 

Non AME approach:
I managed to use FFMPEG in GITBash (command line) to stitch the png sequence together and export a webm vp9 with alpha and it worked fine — but it would be much easier for my team to be able to just use Media Encoder for the process of making small looping videos with transparency for websites.

Im wondering now if this is even possible in AME.