You can specify a function using ANOFA::count.
ANOFA::count
an_count <- \(x) ANOFA::count(x) do.call("an_count", list(c(1,2,3)))
By the way, plyr is a retired package. It is recommend to use dplyr or purrr instead. See: https://github.com/hadley/plyr
plyr
dplyr
purrr