Is there a built-in Underline in iOS?

Does anyone know if it's possible to quickly underline text in the Obsidian app on iOS?

The keyboard toolbar has Bold, Italicize and Strikethrough, but no shortcut (or even an option) for Underlining.

I saw that there's a free community plugin, but for security purposes I'd prefer to keep my account offline.

Moreover, I think you can underline via markdown, but trying to type <u/ </u> on a phone keyboard is kinda difficult.

Simply put, is there any way to quickly and easily underline text using the built-in features of the app?

Thank you, and sorry if this is a silly question, I'm very new to this app!