What is the backstory of the "one for his nibs" in card games?

Nibs is an important or self-important person —usually used in the phrases his nibs or her nibs as if a title of honor.

https://www.merriam-webster.com/dictionary/nibs

In cribbage, nobs is the name given to the Jack of the turn-up suit. That is, if the turn-up card is a four of Diamonds, then the player holding the Jack of Diamonds scores an extra point in their hand, known as “one for nobs” (sometimes “knobs”) or “one for his nob”
(or sometimes “his nibs”)

https://www.sidmartinbio.org/what-are-nibs-and-nobs-in-cribbage/

“One for his Nobs” for a person holding the Jack of the same suit as the cut card. It is scored one point when counting your hand or your crib.

“One for his nibs” or One for his heels” is two points for the person who’s cut is a Jack scored immediately.

Along with an earlier form “nabs,” “nibs” was based on “nob,” an alternate spelling of “knob” and an 18th century slang term for “head.” The “head” in question was both literally the human head and “head man,” or an important person (THE JACK)

Most people just refer to either as nibs nowadays.

I was taught cribbage by my grandfather 65 years ago. One for his knob and two for his heels we used to say. We played with matches stuck in a homemade board.

@flutherother a wonderful memory