JSFiddle - React, Tailwind, and code Playground

HTML

<input type="radio" class="parcelshop" name="data[shipping_address][address_firstname]" value="95621"> Click me

<input type="text" value="D1" id="address_lastname" name="data[shipping_address][address_lastname]">

JavaScript

jQuery(function($) {
  $(".parcelshop").click(function() {
    $("#address_lastname").val(this.value); // Put the value into the Amount field
  });
});