In an Input control I'd like it labelled without use of a Label control, could the association ariaLabelledBy make labelling easier? How is this association implemented?
ARIA (Accessible Rich Internet Applications) is a set of attributes that helps people with disabilities to access a web page e.g. with a screen reader.
so the "ariaLabelledBy" won't help you in your task.
Read more about Accessibility in the UI5 Demo Kit