Display a character as the colorcolumn.
Use your favourite plugin manager to install.
For lazy.nvim:
{ "lukas-reineke/virt-column.nvim", opts = {} },
For pckr.nvim:
use "lukas-reineke/virt-column.nvim"
To configure virt-column.nvim you need to run the setup function.
require("virt-column").setup()
Please see :help virt-column.txt
for more details and all possible values.
Thank you @francium for the idea.