Adding Edit/Open with Code - OSS
to the menu (depending on whether it is a file or a folder).
"Code - OSS" is a fully Open Source VSCode build (like Chromium is to the Google Chrome?) with less of telemetry.
Either download through Dolphin's Context Menu Settings
(Burger menu -> Configure -> Configure Dolphin -> Context Menu -> Download New Services -> <Search for my listing>
)
or downloading *.desktop files manually from the KDE Store or this github repo, and putting them in ~/.local/share/kservices5/ServiceMenus/
for Plasma 5, or ~/.local/share/kio/servicemenus/
for Plasma 6.