Set custom window postion with game user settings?

Ho do i do this?

To set the window size in an Unreal Packaged game i can use the getGameUserSettings and the ApplyResolutionSettings nodes and set ResolutionSizeX=900 in the DefaultGameUserSettings.ini.
But how to set the window position? currently defaults to top left

My DefaultGameUserSettings

[/Script/Engine.GameUserSettings]
ResolutionSizeX=900
ResolutionSizeY=900
FullscreenMode=0
Version=5

Hello!

Can you confirm that you are using a UMG blueprint class?

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Thank you!