Use case

Using SemanticsProperties.header, we can configure an element with the heading role. However, because there isn't a way to set the level of the heading, all headings on the page default to level 2.

Proposal

Allow setting the heading level through something like SemanticsProperties.headerLevel. This could map to aria-level on web and AccessibilityHeadingLevel on iOS. I'm not sure if there's an equivalent on Android.