How to write this note from chaconne?

[Edmundo Carmona Antoranz]

Hi!

You know the chaconne from BWV 1004, right? On the bar before last,
there's an apparent dot written at the position of the f at the
opening of the bar. I didn't know if it was a staccato mark or other
kind of expressive mark for the violin or a mistake but I also found
it on Anna Magdalena' Bach's manuscrit, not just Bach's. So I asked
around[1] and apparently it's a "harmonic delay" or a prolongation...
it's the first time ever I see something like that written on a part
(though I know the concept of the harmonic delay from the few classes
of harmony I did "back in the day"). So.... I looked around how to
write it on lilypond but i found nothing. What do you think is the
best way to achieve it?

Thanks in advance.

[1] 
https://music.stackexchange.com/questions/67493/bwv-1004-is-there-a-pause-by-the-end-of-ciaccona-or-is-it-staccato