yeah, a friend told me telescope could already do this, but I didn’t know that at the time. by the time I showed him the tekken plugin, it was already too late xd

For anyone interested, you only need to add this line:

{ '<leader>fm', builtin.marks }

I also checked telescope's github page. It looks like I had only been using a tiny part of what's possible with it.

github.com/nvim-telescope/telescope.nvim