Selected text remove element already wrapped in a span

I have a scenario/dilemma, I am a little stuck trying to figure out. Below will be my best of a visual representation.

1. I select

This is dummy text to select

2. I bold and it gets wrapped with a span

This is dummy text to select

<h2 This is dummy <span style="font-weight: 700;">text to select</span></h2>

3. Now lets say I want to select some text but we know it's already wrapped in a span

This is dummy [BOLD]text[BOLD] to select

4. Its a crossover with selected text, so now my code. In my important comment, I can identify that the element is found in the selection. But how can I find it and then remove the span.

const el = document.createElement('span');

  function handleNodeWrap(){
    if(selection?.containsNode(el,true)){
      //! IMPORTANT find and remove element of selected text
    }
    surroundSelection(el);
  }

Here's one approach to remove the span from the selected text:

const el = document.createElement('span');

function handleNodeWrap() {
  if (selection?.containsNode(el, true)) {
    // find parent node of the selected text
    let parentNode = selection.anchorNode.parentNode;
    // create a new range that selects the entire content of the parent node
    let range = document.createRange();
    range.selectNodeContents(parentNode);
    // replace the content of the parent node with the plain text version
    let text = range.extractContents().textContent;
    parentNode.textContent = text;
  } else {
    surroundSelection(el);
  }
}

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