customize shopify code example

Example 1: how to add jquery to shopify

<!-- Include jQuery in your theme.liquid file, between <head> tag  -->
  
  <head>
    <script
    src="https://code.jquery.com/jquery-3.4.1.js"
    integrity="sha256-WpOohJOqMqqyKL9FccASB9O0KwACQJpFTUBLTYOVvVU="
    crossorigin="anonymous">
  	</script>  
  </head>

Example 2: can we update app code in shopify

You need to contact the individual app|service, as using them with your store 
doesn't grant you access to their code or ability to the source of generated 
assets for your store. That is something they have to build as a feature.

Example 3: custom js shopify

If I understand correctly, the asset_url filter is what you are looking for.

To include a JS file in a .liquid file, you use:

{{ 'script.js' | asset_url | script_tag }}

And a CSS file:

{{ 'style.css' | asset_url | stylesheet_tag }}

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Misc Example