How to replicate pre 2.0 custom registry lua entry?

[RayJameson]

Hello, I spend 3 hours trying to migrate to the new API, but couldn't make it work.
pypi (pip) doesn't accept unversioned package anymore, and it's hardcoded in format string method

mason.nvim/lua/mason-core/installer/managers/pypi.lua

Line 212 in 7c7318e

opts.extra and ("%s[%s]==%s"):format(pkg, opts.extra, version) or ("%s==%s"):format(pkg, version),

The problem is, if you install using git+https, there is no version

Before 2.0 this worked flawlessly

lua/custom-registry/init.lua

return {
  systemd_ls = "custom-registry.packages.systemd_ls",
}

lua/custom-registry/packages/systemd_ls.lua

local Pkg = require("mason-core.package")
local pip3 = require("mason-core.managers.pip3")
return Pkg.new {
  name = "systemd_ls",
  desc = [[Language Server for Systemd unit files]],
  homepage = "https://github.com/RayJameson/systemd-language-server",
  languages = { Pkg.Lang.systemd },
  categories = { Pkg.Cat.LSP },
  install = function(ctx)
    pip3.install({ "git+https://github.com/RayJameson/systemd-language-server.git" }):with_receipt()
    ctx:link_bin("systemd_ls", "venv/bin/systemd-language-server")
  end,
}