How about supporting object depth when using function properties?

[twoshlove]

A namespace is needed because your plugin uses a global function.

In the current structure, only window 1depth objects can be registered.

parse: (value, attribute, element) => {
    const fn = (() => {
      if (typeof window !== "undefined" && value in window) {
        // @ts-expect-error
        return window[value] // only window 1depth objects can be registered!!
      }

      if (typeof global !== "undefined" && value in global) {
        // @ts-expect-error
        return global[value]
      }
    })()

    return typeof fn === "function" ? fn.bind(element) : undefined
  },

It would be nice to modify this part so that it can be defined as N depth.

<custom-ele func="action" /> ( O )
<custom-ele func="ns.action" /> ( X )
<custom-ele func="ns.action.get" /> ( X )