Redirect Sub-domain to Sub-directory (.Net Core)

I've been trying to figure out for a while now if the following implementation is possible with WinHost and would be happy with any feedback.

I have the following sub-domain:

http://myapp.example.com

I have an application startpoint for a .Net Core 3.0 app on a shared Windows server at the following path from the domain root:

root/myapp

I've modified the web.config in my domain's root directory as follows to be able to reach the application via the subdomain (myapp.example.com):

<rule name="myapp.example.com" stopProcessing="true">
<match url=".*" />
<conditions>

<add input="{HTTP_HOST}" pattern="^(www.)?myapp.example.com" />
<add input="{PATH_INFO}" pattern="^/myapp/" negate="true" />​

</conditions>
<action type="Rewrite" url="\myapp\{R:0}" />
</rule>

While the application homepage loads fine initially with the proper url of myapp.example.com, when I make any requests in my application the URL displays as follows:

http://myapp.example.com/myapp/{app routing}

Problem: How would I remove the "myapp/" subdirectory path from the URL on all requests?

I figure the required change should be made in one of the following locations:

1. Domain root web.config
2. Startup.cs in MyApp using URL Rewriting Middleware
3. XML file imported with URL Rewriting Middleware in Startup.cs of MyApp.

I am having a ton of issues understanding the .NET Core URL Rewrite Middleware if that is what needs to be used in this case.