How was this done? I looked into APIs and I can't find anything on it

I recently saw this game advertised on a social media platform:

You can draw on a model and upload it just for yourself (not for sale) on your account. How exactly is this possible? Here’s a picture of the purchase window..


I drew on a head mesh ingame and I’m seemingly able to purchase it.
I looked into apis and stuff on the wiki and I can’t find anything about it. The creator’s bio says they’re a member of the “Roblox Research Panel” although I’m unsure if this means anything.

How was this done?

– Offical Uncopylocked for it
Roblox Avatar Creator - Roblox

– Offical Annoucnments
[Client Beta] In-experience creation for Accessories and Layered Clothing - Updates / Announcements - Developer Forum | Roblox

it uses Offical Created API(-s) by year ago and newest one(-s) (see in announcments)

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