How to attach onClick Listener dynamically in a span tag and store it in MongoDB

I am trying to attach an onClick even in a span tag as like as below and would like to store it in MongoDb . but my event is not saving it is automatically removed and when I am fetching data from DB it is not available. How Can I fix it ? here is my code below

 let span = document.createElement("span");
        myEvent=span;
        
        myEvent.setAttribute('onClick', 'removeElement');

here is what is storing in the db,

<span onclick="removeElement" data-highlightid="1622237808204" style="background-color: rgb(114, 76, 249); cursor: pointer;">passages of Lorem Ipsum available, but the majority have suffered alteration in some form, by injected humour, or randomised words which don't look even slightly believable. If you are going to use a pa</span>

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