I'm not sure of a specific titled 'bella is a waitress possessive edward fanfic' right off the bat. But you could try searching on fanfic platforms like Archive of Our Own. Usually, fanfic authors play around with this concept in different ways, some might focus on the power dynamics in their relationship given Edward's possessiveness and Bella's job as a waitress.
There may be many fanfics out there with this theme. You could also look for fanfic communities on social media platforms dedicated to the Twilight series. Members might be able to point you towards some great 'bella is a waitress possessive edward fanfic'. Sometimes these fics explore not just their relationship but also how Bella's job as a waitress affects her self - identity within the context of Edward's possessive love.
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Chapter 512, "The Ultimate Rich Foolish Uncle", is the clearest early answer because it turns Youth Trainee's situation into a concrete plot event. The setup is An Jing would have been surprised if she could recognize him;
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Chapter 130, "Director Sun: He Got Schooled Again?", is the clearest early answer because it turns Uncle Zhao's situation into a concrete plot event.
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