How to set a corner radius for NSAttributedString's background?

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I want to set a corner radius for partial text on UILabel. I've got the range.
The following code set the background color, but it gonna be a rectangle background.

So, my problem is how to set a corner radius to it?

string.setAttributes([NSBackgroundColorAttributeName: UIColor.red], range: range)

Thank you for any suggestion.

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