HumanoidDescription should support images/decals for the "Face" category

The Problem

As a Roblox developer, it is currently too difficult to leverage HumanoidDescriptions for creating truly custom characters. I cannot use self-made (or public) decals/images for HumanoidDescription faces.

There used to be odd workarounds for this, but they no longer appear to work. Even if there are remaining functioning workarounds, they are not intuitive.

A Specific Example

I would like to dynamically create an NPC for a ViewportFrame. This NPC has a decal asset for a face. As a result, I cannot rely on solely HumanoidDescriptions to create it.

I must write a custom schema/solution for handling custom face assets. This is something that HumanoidDescription should likely cover out of the box.

The Ask

Allow decals/images to be used in the HumanoidDescription “Face” category.

Why This Matters

If this issue is addressed, it would improve my development experience because I would be able to quickly create custom avatars with HumanoidDescriptions (without having to code custom solutions for the “Face” category).