Did you ever figure out how to get the NanoVNA-Web-Client to connect to your Chromebook?
I have not yet tried with the store app; got distracted..
My Samsung Chromebook with either sideloaded apk or web client
also will not connect.
Did you try connecting with Chromebook 'Diginow Serial Terminal' ?
That worked on mine for nanoVNA shell commands..
Oristo