Padding notehead from right

[Jiri Zurek (Prague)]

What is the correct and working way to add some padding to the right of the
notehead, please? 
I tried "extra-X-extent" and "minimum-X-extent" but it seems not to work (no
padding is added in reality). Eventually, I could add "s" after the note to
create an invisible space after a note, but this is not desirable in my
project (sometimes the line is broken between the note and the s and this is
not desirable), I would prefer that the padding is a property of the
notehead.
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