I'm trying to get some community support behind this Azure DevOps Feature Request to add Custom Public Upstream NuGet Feeds eg. https://nuget.episerver.com/https://developercommunity.visualstudio.com/idea/366068/custom-public-upstream-sources-in-nuget-package-ma.html
Currently, public upstream feeds are limited to nuget.org and npmjs.com.
UpdateGood news! Thanks to community support, Azure DevOps community idea for custom public upstream sources for Nuget Packages has been accepted by Microsoft, and it's status has changed to On Roadmap
Thanks to anyone in the Episerver community that voted for this.