Show # for root and $ for normal user.

[rafaone]

Is there any way to print # when is logged with root, and print $ on prompt when logged with normal user.
I dont need to show the user name, only print # or $.

my currently is

[username]
style_user = "green"
style_root = "red"
format = "[$user]($style)"
disabled = false
show_always = true
aliases = { "root" = "#", "userx" = "$" }

its show username $ , in green or red, and I need to show only # or $