Select – Options value

Hello,

I want to know if there is a way to add value to the options tag from the select field?

Something like this:

<select data-placeholder="Choisir une assurance" name="myfield1" id="myfield1">
    <option value="test1">Test 1</option>
    <option value="test2">Test 2</option>
    <option value="test3">Test 3</option>
</select>

My goal is to use javascript to target and change the selected option.

Thank you in advance