Set mark at index N

[shellwhale]

The docs show how to access the N mark.

vim.keymap.set("n", "<C-h>", function() harpoon:list():select(1) end)
vim.keymap.set("n", "<C-t>", function() harpoon:list():select(2) end)
vim.keymap.set("n", "<C-n>", function() harpoon:list():select(3) end)
vim.keymap.set("n", "<C-s>", function() harpoon:list():select(4) end)

But how do I set the N mark with a shortcut ? For example if I'd wanted to set the current file to be at index 3 I would do something like this :

vim.keymap.set("n", "<C-M-s>", function() harpoon:list():set(3) end)

Is that possible? I'm coming from vscode-harpoon and there was a nice command for it. I had setup like this

CTRL + ALT + 1 mark current file at index 1
CTRL + ALT + 2 mark current file at index 2
CTRL + ALT + 3 mark current file at index 3
...
ALT + 1 go to file at index 1
ALT + 2 go to file at index 2
ALT + 3 go to file at index 3