No.
This is brought up every once in a while, even this week, generally by folks who do no understand any of these structures … and the answer is always no.
The AUR is not supported, and there are no intentions of somehow ‘mirroring’ it or otherwise.
The AUR is quite literally the Arch USER Repository - it is where ANYONE can create and post a PKGBUILD. It is FOR ARCH, and it is entirely 3rd party.
Interacting with it in any way is your own responsibility.