What it does
A CAP project with the UI5 CLI app as an npm workspace under app/* and cds-plugin-ui5 as a devDependency. Its app README gives the address as http://localhost:4004/be.wl.serversiderendering/index.html after starting the CAP project, and be.wl.serversiderendering is the metadata/name in that project's ui5.yaml, so the mount path the plugin derives is visible in a running setup.
Conditions
The CAP project is started first and the app is opened on its port, as the app README instructs
Remaining work
Nothing in the repository sets the mount path or the middleware list beyond what the app's own ui5.yaml configures, and the pair of versions above is the one it pins.