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you mean: https://www.qt.io/blog/new-qt-extension-for-visual-studio-code-1.0-published ?
I haven't use the plugin https://marketplace.visualstudio.com/items?itemName=TheQtCompany.qt to be honest, but in case it doesn't work out of the box wrt QtQuick aspects, I'd open a bug report on their JIRA project, or ask in the forum.
From what I know, there is no much Python support there, but they are working on it: https://bugreports.qt.io/projects/VSCODEEXT/issues/VSCODEEXT-3?filter=allopenissues (notice that VSCODEEXT is the JIRA for that extension, not PYSIDE)