The normal Office 365 ADM Templates do not cover OneDrive for Business so who do you configure OneDrive from a GPO?

Well, this is achieved by first of all downloading the latest version of the OneDrive Sync client, which can be obtained from the OneDrive release notes

https://support.microsoft.com/en-us/office/onedrive-release-notes-845dcf18-f921-435e-bf28-4e24b95e5fc0?ui=en-us&rs=en-gb&ad=gb

Once you have downloaded the client, you need to Install the OneDrive sync app for Windows. In doing this it installs the sync app and downloads the .adml and .admx files.

Browse to %localappdata%\Microsoft\OneDrive\BuildNumber\adm\ (for per-machine sync app browse to C:\Program Files (x86)\Microsoft OneDrive\BuildNumber\adm\ or Program Files\Microsoft OneDrive\BuildNumber\adm\ (depending on the OS architecture)), to the subfolder for your language, as necessary (where BuildNumber is the number displayed in sync app settings on the About tab).

Copy the .adml and .admx files.

Paste the .admx file in your domain’s Central Store, \\domain\sysvol\domain\Policies\PolicyDefinitions (where domain is your domain name, such as corp.contoso.com), and the .adml in the appropriate language subfolder, such as en-us. If the PolicyDefinitions folder does not exist, see How to create and manage the Central Store for Group Policy Administrative Templates in Windows, or use your local policy store under %windir%\policydefinitions.

Once the above is completed you will be able to configure Group Policy

Computer Configuration Policies

User Configuration Policies

Regards
Andrew Moran