Nuget.Protocol sdk how to pass proxy uri and API key

[VishnuJin]

Im trying to use Nuget.Protocol to query nuget.org v3 but since im behind corporate proxy i need to pass my http_proxy to the request. But im struggling to find how to do this efficiently
the cuurent working way i figured is usign a config file and then load it like below, although it works i would like construct the configs in memory like VirtualSettings rather than reading/writing to the file.

using NuGet.Common;
using NuGet.Configuration;
using NuGet.Protocol;
using NuGet.Protocol.Core.Types;

// this config file has creds and http_proxy uri set
var settings = Settings.LoadDefaultSettings(@"C:\Users\myuser\AppData\Roaming\NuGet\NuGet.Config");

var packageSource = new PackageSourceProvider(settings).GetPackageSourceByName("Artifactory");
var  repo = Repository.Factory.GetCoreV3(packageSource);
    
var resource = await repo.GetResourceAsync<FindPackageByIdResource>();
var versions = await resource.GetAllVersionsAsync("Newtonsoft.Json", new SourceCacheContext(), NullLogger.Instance, CancellationToken.None);
Console.WriteLine($"Available versions of Newtonsoft.Json: {string.Join(", ", versions)}");