Apache: How to create a sub-directory which would serve node.js app running on a port?

I am trying setup Apache to have multiple routes/links/sub-directory for multiple apps (node.js app, react app)

For example,

mydomain.net/projects/app1

mydomain.net/projects/app2

And these apps would start on its individual ports like app1 runs on port 81, app2 runs on port 82,… and so on.

I had already try to create a virtualhost in /etc/apache2/sites-available/newRoute.conf

<VirtualHost *:80>

        ServerName mydomainname.net
        ServerAlias www.mydomainname.net
        ServerAdmin name@hotmail.com

        RewriteEngine On
        RewriteCond %{HTTP:Upgrade} =websocket [NC]
        RewriteRule /(.*)                       ws://localhost:3000/$1 [P,L]
        RewriteCond %{HTTP:Upgrade} !=websocket [NC]
        RewriteRule /(.*)                       http://localhost:3000/$1 [P,L]

        ProxyPassReverse / http://localhost:3000/

</VirtualHost>

<VirtualHost *:80>

        ServerName mydomainname.net/test
        ServerAlias www.mydomainname.net/test
        ServerAdmin name@hotmail.com

        ProxyPass /test http://localhost:81/
        ProxyPassReverse /test http://localhost:81/

</VirtualHost>

but it didn’t work out. I started the node.js app on port 81 and browse to mydomainname.net/test, and it just display my mydomainname.net content.

In addition, localhost:3000 is just a react app which has homepage content

Also, the node.js app which running on localhost:81 would print “hello world” on the screen.

Thank