Specifying a blank hostname in mta.yaml/mtaext for a HANA XSA application?

Hello, Experts,

Although it is certainly possible to assign an app to a route with a blank hostname in a certain domain (i.e. assign the app to the domain itself and not hostname.domain) via HANA XSA cockpit and/or via xs command line client. But it does not seem to be possible from the mta.yaml or mtaext file. Or maybe there is a way to do it?

Thanks,

Sigitas