That is to say, the text is there to express desire, to put in motion, and to make manifest desire or a desire.

也就是说，文本就是用来表现内心真正的欲望，用一种动态的方式来展现愿望的。

耶鲁公开课 - 文学理论导论课程节选

Another situation where you can use "I wish" is when you express regret, a desire to stay longer, for example.

另一种使用“I wish”的情况是当你表达遗憾的时候，例如，希望多待一段时间。

I wish 课堂 - SpeakingMax英语口语达人