asset

fonts/MyCustomFont.ttf

style

italic

Then assign the font to your Text widget:

How do I style my Text widgets?

Along with fonts, you can customize other styling elements on a Text widget.
The style parameter of a Text widget takes a TextStyle object, where you can
customize many parameters, such as:

color

decoration

decorationColor

decorationStyle

fontFamily

fontSize

fontStyle

fontWeight

hashCode

height

inherit

letterSpacing

textBaseline

wordSpacing

Form input

For more information on using Forms,
see Retrieve the value of a text field,
from the Flutter cookbook.