Xcode 12 and iOS 14 added support for SVGs but I believe this was only on build time, so the SVGs are actually converted to PNGs which are then loaded on runtime.
As far as I know, iOS doesn’t support loading SVGs at runtime, so if I was to ads support for this in Scriptable, I would have to build it myself or rely on a third party dependency. Neither of those are super appealing.
That said, I can certainly see the benefit of adding support for SVGs. If many users have the need for it, I’ll consider it for a future update