How do I set the vim working directory to the project root?

[NiklasKappel]

In vim, if I type :e <tab> the autocompletion suggestions are relative to the directory where I run vim from (normally this is the root directory of the project I am working on). In the vscode vim extension, the suggestions are relative to the directory of the currently focused file. Can I configure the extension that that suggestions are always relative to the folder I select in vscode via "File -> Open Folder..."?