update-process for OneDrive for business with offline-clients (internal network only)

Hi techcommunity,

currently I’m designing the update-process for OneDrive for Business for an enterprise network. Following preferences are set:

• computerbased installation
• Sharepoint 2019 on-prem as backbone (no hybrid or cloud-only, nor O365)
• deployment via Endpoint Configuration Manager 2010 package
• only for syncing team-directories, no personal folders
• configuration via GPOs

Now I have the problem that we have computers that are used in intranet-only networks with no internet connection, so updating via the built-in standalone updater won’t work from scratch.

Now I have to options afaik:

Either we deploy new updates in a certain update-cycle (deferred ring) with new EPCM-Packages or we declare an internal update resource like mentioned here: https://docs.microsoft.com/en-us/onedrive/sync-client-update-process#how-we-release-updates-through-multiple-rings
“Deploy new versions from an internal network location to avoid using Internet bandwidth. (If you don't deploy an update after 60 days, it will be automatically downloaded and installed.)”

Unfortunately I can’t find the needed setting to declare an internal network location. In the GPO-Templates there is no such setting to be found. How do I manage this best?

Thanks in advance