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Add text to SVG path dynamically

I have an SVG exported from Adobe Illustrator with several paths like this, which produces a small polygon I intend to use as a text box

<svg viewbox="387 390 74 20">
        <path class="st37" d="M452,408h-56c-4.42,0-8-3.58-8-8l0,0c0-4.42,3.58-8,8-8h56c4.42,0,8,3.58,8,8l0,0     C460,404.42,456.42,408,452,408z" />

I’d like to dynamically add text to it. I’ve seen many similar questions here, but most of them involed specifying a x and y property for a text element based on the x and y property the path element. My path, however, does not have such properties.

I’ve tried to use a textPath element with xlink:href pointing to my path. I gets attached to the path, but the text wraps my path element instead of being inside it.

So, is there a way to achieve this? I’m open to different solutions here. My dream would be to use javascript to get the path element and add the text from there. But I could also edit the base SVG file to add a text or any other relevant element and attributes to make this work, as long as I can change the text dynamically from javascript later. And since this SVG is produced by Illustrator, I could also try different export options there in order to get a proper output for my goal.



Here’s some sample code that takes a label path and adds a <text> element after it with whatever text you choose.

let label1 = document.querySelector("#label1");

addLabelText(label1, "Something");

function addLabelText(bgPath, labelText)
   let bbox = bgPath.getBBox();
   let x = bbox.x + bbox.width / 2;
   let y = bbox.y + bbox.height / 2;
   // Create a <text> element
   let textElem = document.createElementNS(bgPath.namespaceURI, "text");
   textElem.setAttribute("x", x);
   textElem.setAttribute("y", y);
   // Centre text horizontally at x,y
   textElem.setAttribute("text-anchor", "middle");
   // Give it a class that will determine the text size, colour, etc
   // Set the text
   textElem.textContent = labelText;
   // Add this text element directly after the label background path
.st37 {
  fill: linen;

.label-text {
  font-size: 10px;
  fill: rebeccapurple;
  transform: translate(0, 3px); /* adjust vertical position to centre text */
<svg viewbox="387 390 74 20">
    <path id="label1" class="st37" d="M452,408h-56c-4.42,0-8-3.58-8-8l0,0c0-4.42,3.58-8,8-8h56c4.42,0,8,3.58,8,8l0,0     C460,404.42,456.42,408,452,408z" />
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