Create new label in Gmail My wife has an iPhone, she goes to hamburger and "create new label".

I have a Google pixel, I don't have this feature. Or do I, and I'm just being blind?
No you are not being blind.

From: https://support.google.com/mail/answer/118708?co=GENIE.Platform%3DAndroid&amp;hl=en

In the Android tab of: 

Create labels to organize Gmail

Section named:

Create, edit &amp; delete labels


  On a computer, open Gmail. You can't create labels from the Gmail app.


I would suggest sending feedback from the app.