How use weboptimizer to with multiple virtual directories and single wwwroot - asp.net-mvc

Question

ASP.NET 5 MVC Core application serves multiple sites using LigerShark WebOptimizer ( https://github.com/ligershark/WebOptimizer )
https://example.com/store1
https://example.com/store2
https://example2.com
All those sites should served from wwwroot directory containing same files for those urls.
Sites are defined in hosts.json file:
{
"EevaHosts": {
"example.com/store1": {}
"example.com/store2": {}
"example2.com": {}
}
}
I tried code below to force WebOptimizer to use same wwwwroot directory for every site in Debian Linux but got exception for https://example.com/store1/site.js
No files found matching "/store1/js/site.js" exist in
"/var/www/appbasedir/wwwroot/"
How to force web optimizer to use same wwwwroot directory for all sites ?
If Weboptimizer middleware is removed, static files are serverd properly.
In StartUp.cs:
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{ ...
var eevakonf = new ConfigurationBuilder().AddJsonFile("hosts.json").Build();
foreach (var host1 in eevakonf.GetSection("EevaHosts").GetChildren())
{
if (!host1.Key.Contains("/"))
app.UseWebOptimizer();
else
app.UseWebOptimizer(env, new FileProviderOptions[] { new FileProviderOptions()
{
// example.com/store1 -> /store1
RequestPath = new PathString(RequestPathExtract(host1)),
FileProvider = env.WebRootFileProvider
}
});
}
// Using single call causes the same exception:
//HashSet<FileProviderOptions> fp = new();
//foreach (var host1 in eevakonf.GetSection("EevaHosts").GetChildren())
//{
// if (host1.Key.Contains("/"))
// fp.Add(new FileProviderOptions() {
// RequestPath = new PathString(RequestPathExtract(host1)) ,
// FileProvider = env.WebRootFileProvider
// });
//}
//app.UseWebOptimizer(env, fp.ToArray());
foreach (var host in eevakonf.GetSection("EevaHosts").GetChildren())
{
if (!host.Key.Contains("/"))
app.UseStaticFiles();
else
{
app.UseStaticFiles(new StaticFileOptions
{
RequestPath = new PathString(RequestPathExtract(host))
});
}
}
}
static string RequestPathExtract(IConfigurationSection host)
{
return "/" + StrExtract(host.Key, "/");
}
static string StrExtract(string cSearchExpression, string cBeginDelim)
{
int nbpos = At(cBeginDelim, cSearchExpression);
return cSearchExpression[(nbpos + cBeginDelim.Length - 1)..];
}