How to specify the user_data_dir?

[yd278]

I've dug in the source code and no luck. I can only see that the pulgin will search for ibus, fcitx or fcitx5's config directory, however, I didn't install any of them and have my own config files.
Simply setting

local Rime = require('rime.nvim.rime').Rime
local rime_config = {
  session = {
    traits = {
      user_data_dir = os.getenv("HOME") .. "/.config/Rime",
    }
  }
}
local rime = Rime(rime_config)

does not work.

[Freed-Wu]

https://github.com/rimeinn/rime.nvim/#other-frontends-of-librime