First, free translation, your word "Jade Qiong" means beautiful jade, so you call yourself Jade Emperor.
Second, transliteration, from the inherent and commonly used names in English, just find a close one that you like. For example, Jenny Huang will do
In a word, transliteration and free translation of names cannot both be in tune. When introducing yourself, you can make an explanatory translation and name it, or you can follow the two principles of "smooth and easy to hear".