JSFiddle - React, Tailwind, and code Playground

HTML

<table class="test">
  <tr>
    <td>Section Heading 1</td><td>Section Text 1</td>
  </tr>
  <tr>
    <td>Section Heading 2</td><td>Section Text 2</td>
  </tr>
  <tr>
    <td>Section Heading 3</td><td>Section Text 3</td>
  </tr>
  <tr>
    <td>Section Heading 4</td><td>Section Text 4</td>
  </tr>
  <tr>
    <td>Section Heading 5</td><td>Section Text 5</td>
  </tr>
</table>

JavaScript

$(function() {
    var searchText = "Section Heading 3";
	var output = "";
	$("td").each(function(i, item) {
		if($(item).html() == searchText) {
			output = $(item).html();
			output += $(item).closest("td").html()
		}
	});

	console.log(output);
});