windows 10 QT configuration / QSS?

thats_a_movie

I gather that this UI is controlled by a framework called QT and that I should be able to answer my questions by studying those docs; I've been unsuccessful so far and hoping for a little direction from someone who's seen more than myself

I'm on windows 10 and having trouble applying a QSS stylesheet to customize the colors/appearance of the app. I built the thing from scratch yesterday so I'm on qt 6.9.1 and I guess I have three questions:

is it possible on windows to customize the appearance of the application through QT stylesheets? A link to the relevant doc or even a brief comment explaining how to accomplish this would be extremely appreciated
if not, is there a way to accomplish this appearance customization goal at all, without modifying the source code? I've seen references to what I think is an external "qt configurator" app, but I've only seen linux examples so far
if not, could someone be so kind as to point me in the right direction to the relevant code so I can try to modify the appearances myself?

[what I've tried so far]

I believe I've exhaustively checked strawberry's in-app options

I've read through various docs and forum posts like https://forum.strawberrymusicplayer.org/topic/334/add-a-dark-mode/22 and https://doc.qt.io/qt-6/qtquickcontrols-fusion.html#customize-fusion-style and confirmed that setting the fusion style in Strawberry's preferences does give a darker style, which was a great improvement for me already (thanks!)

Similar apps built on QT seem to follow a pattern of loading from Documents/$AppName/Styles/style.qss; this didn't work

I saw a suggestion to try setting the stylesheet path as an env var when launching $app, that didn't help

thank you