I want have variable row in such a way that for soo1 the row is just 1, for soo1 the row is 2…. Any thoughts?

library(dplyr)

data1 <- tibble(
  "id" = c("soo1", "soo1", "soo2", "soo2", "soo3"),
  "amount" = c(100, 21, 23, 23, 45)
) |> 
  group_by(id) |> 
  mutate(row = row_number())