These snippets are based of the ones of Gilles Castel blogpost in which he described it.
This config will work for a lazy neovim.
return {
"SirVer/ultisnips",
keys = {
{"<tab>", vim.cmd.UltiSnipsExpandTrigger},
{"<C-u>", vim.cmd.UltiSnipsEdit},
{"<C-n>", vim.cmd.UltiSnipsJumpForwardTrigger,
{"<C-b>", vim.cmd.UltiSnipsJumpBackwardTrigger},
}
}
}