An option to link hlgroups

[saidelmark]

This colorscheme allows to customize highlight groups, but only in terms of "set custom values for fg, bg or style". Would be cool if it would also add an option "link" to allow for configuration like this:

local monokai = require('monokai')
local palette = monokai.classic
local bg = '#181810'
monokai.setup {
    custom_hlgroups = {
        Normal = {
          bg = bg
        },
        NormalFloat = {
          link = 'Normal'
        },
    }
}

Is it doable?