Alerts can you insert a line break or newline or HTML

Is it possible to insert any sort of line break in the text in an alert?

alert('my first line' + magic-line-break-thing + 'my second line')

This works :

lbl = Label()
lbl.text="Line 1\nLine2"
alert(lbl)

Edit -

or as a 1-liner :

alert(Label(text="Line1\nLine2"))
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