A general approach for using standard font size options and weights that work with SwiftUI TextField. For example:
TextField("Name", text: $name)
.font(Font.headline.weight(.light))
Available standard size options (smallest to largest):
.caption
.footnote
.subheadline
.callout
.body
.headline
.title3
.title2
.title
.largeTitle
Available standard font weights (lightest to heaviest):
.ultralight
.thin
.light
.regular
.medium
.semibold
.bold
.heavy
.black