No autocomplete for the "submodules" of a library when those included from init.lua

Dear developers, I've read similar existing issues but didn't find the answer.

I have a library (which I am the developer of) which has this structure:

and init.lua is

local UI = (...) .. '.'

return {
    Block     = require(UI .. 'Block'),
    Image     = require(UI .. 'Image'),
    Label     = require(UI .. 'Label'),
    Layout    = require(UI .. 'Layout'),
    Rectangle = require(UI .. 'Rectangle'),
    Stack     = require(UI .. 'Stack'),

    ImageButton = require(UI .. 'ImageButton'),
    TextField   = require(UI .. 'TextField'),

    utils     = require(UI .. 'utils')
}

and the rockspec contains this:

build = {
   type = 'builtin',
   modules = {
      ['likelihud']             = 'likelihud/init.lua',
      ['likelihud.Block']       = 'likelihud/Block.lua',
      ['likelihud.Image']       = 'likelihud/Image.lua',
      ['likelihud.Label']       = 'likelihud/Label.lua',
      ['likelihud.Layout']      = 'likelihud/Layout.lua',
      ['likelihud.Rectangle']   = 'likelihud/Rectangle.lua',
      ['likelihud.Stack']       = 'likelihud/Stack.lua',
      ['likelihud.ImageButton'] = 'likelihud/ImageButton.lua',
      ['likelihud.TextField']   = 'likelihud/TextField.lua',
      ['likelihud.utils']       = 'likelihud/utils.lua',
   },
}

So after install I have

Coc-config:

{
    "suggest.noselect": true,
    "Lua.workspace.library" : [
        "/usr/local/share/lua/5.1"
    ]
}

The problem

If I write

local Button = require('likelihud.ImageButton')

I get autocomplete for Button.

But if instead I do

local ui = require('likelihud')

I get only those fields when I do ui., but the fields are unknown. :

So the problem LSP doesn't resolve this (...) .. '.' inside init.lua. Should I somehow change how init.lua provides those files or how to fix that ?

Start with the provided init.lua module and rockspec, then reproduce the two require patterns in LuaLS with the shown workspace.library setting. Trace how dynamic require paths are resolved and how returned table fields receive types; done means ui. offers known, typed fields for the modules exported by init.lua.