Feature Request: Expose internal HSL range selection as a tool (masks, etc)

[NoLand]

The HSL adjustment has a great built-in range selector that can't be mimicked by any other tool.
Exposing this as a tool for creating masks might be a great feature. (And the code for this should be already in place.)
An additional slider/control for optionally adjusting brightness sensitivity may help making this even more versatile.

This could complement or even replace the PS-like "Select Sampled Color…" tool.
(I found this seldom useful, and a HSL-style color range selection would be very useful for any occasions where selections per channel or tonal range aren't suitable.)

Alternatively, the HSL-adjustment may be improved by a button "Export Current Selection".

I know that you can work around this by using a HSL-adjustment + blend modes + B/W + levels + rasterize to mask, but it's a bit awkward to have to jump through all these hoops to achieve something that Affinity Photo has done internally already (and still end up with some artefacts as it's not always possible to perfectly recover the selection by blend modes).