But the main overview is if it is possible to render a shortcode of a custom field from a service page CPT custom field which has been added to a testimonial post inside the testimonial CPT - This then gets displayed via a loop (bricks) in a template back onto the service page.
I think it is possible. But you need to use the code to render the shortcode in a WYSIWYG field value. And I'm not sure if the Bricks builder can help this case, you can contact their support for more information. Please read more on the documentation https://docs.metabox.io/fields/wysiwyg/#template-usage
If it was not Bricks and I was applying it to say a Gutenberg loop, please could you let me know what the process would be? i.e. where to add the code you referenced in your last reply.
It's the PHP code to output the field value so you need to add it to the template file on your theme. If you want to output it in a block, please try to use the custom block of Meta Box. Please read more here https://docs.metabox.io/extensions/mb-blocks/
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