Vertical alignment of the Check/Radio bit w.r.t. labels/content

[Dmitrijs Ledkovs <dmitrij ledkov ubuntu com>]

I am using a checkbox/radio button and I either have custom content or
multiline label next to it.

How do I set vertical alignment of the checkbox/radio bit with respect
to the label/content?

So in the example python-gi code given, I'd like to make checkbox
square to be aligned with the first row, second row, or last.

How do I achieve this?

Regards,
Dmitrijs.