This is related to discussion #3209 and suggested as an enhancement.

For all outputs it would be great if the (supplemental) table and figure numbers could be prefixed with a letter, e.g., naming supplementary figures and tables as  'Figure S1' and 'Table S1'. It's currently possible to use `fig-title: Figure S` to achieve 'Figure S 1', but it's not really ideal.
cscheid
2023-05-10T14:04:44Z
bbartholdy
enhancement crossref
v1.4
open
Further customisation of cross-ref labels
https://github.com/quarto-dev/quarto-cli/issues/5481