How to draw text in trapezoid (or circle)?

Let's imagine that I have some text: "Some attributed text in trapezoid."

I have NSAttributedString extension, which returns me UIImage with attributed text:

extension NSAttributedString {
    func asImage() -> UIImage? {
        defer {
            UIGraphicsEndImageContext()
        }
        let size = boundingRect(with: CGSize.zero, options: [.usesLineFragmentOrigin, .truncatesLastVisibleLine], context: nil).size
        UIGraphicsBeginImageContext(size)
        draw(at: CGPoint.zero)
        return UIGraphicsGetImageFromCurrentImageContext()
    }
}

But this function returns me text in one line, because of using boundingRect:

------------------------------------
|Some attributed text in trapezoid.|
------------------------------------

If I would use custom rect for drawing text it won't help much...

UIGraphicsBeginImageContext(CGRect(x: 0, y: 0, width: 100, height: 30))
draw(at: CGPoint.zero)

...because of text will be in rectangle:

--------------
|Some attribu|
|ted text in |
|trapezoid.  |
--------------

What i need, is to draw text in a trapezoid with known corner positions (or in a circle with known radius). So each new line of text should start with a little offset, see example:

So I want to see something like that:

---------------
\Some attribut/
 \ed text in /
  \trapezoid/
   ---------

How can I achieve this result?