How can I bind different blazor webassemby program into one controller?

Hi, I am intending to develop several Blazor web assembly programs.

For example, my website URL is www.microsoft.com

In my first opinion, I am about to bind the URL like this:

app1.microsoft.com

app2.microsoft.com

app3.microsoft.com

However, the provider of my server limits the subdomain counts to 10.

Now I have to change it like this:

www.microsoft.com/app1/

www.microsoft.com/app2/

www.microsoft.com/app3/

Now the problem is I don't want to add all the blazor programs into one project. And also, I don't want to register any other new domain.

How can I achieve this? Thank you.