I want to implement an auto fit feature

Basically I have a template with a fixed width and height for the Text component and I want to reduce the fontSize when the size of the text gets bigger than the component, so the text always fits inside the Text component

For this I need a way to know the width and height that a text could have with an specific font size, but I don't see a way to get that, It looks like I can use te Canvas component instead of the Text component, I saw that pfdkit has a method called widthOfString that could help me with that, but is not available as part of the painter object in the Canvas, can we add it?