Using MB Blocks in Theme Templates

Hello Meta Box Team,

I would like to use Meta Box blocks in Site Editor templates. I watched the two videos about creating MB Blocks and they both showed manually filling in a value on the right side bar. That is fine for post content, but not for a template where you want the custom field value entered on the post edit screen to be dynamically used by the template.

I have a CPT named Book Authors, which has an associated field group called Author Fields. One of the fields has the slug authors-website. All of the CPT records have a value for this URL field.

https://share.getcloudapp.com/Bluz0Q74

Using MB Builder I created a MB Block called Author Button Block. In the code area I've tried:

{{ authors-website }}

And I've tried:

{% set post = mb.get_post( post_id ) %}
{{ post.authors-website }}

And I've tried this:

{% set args = { 'post_type': 'book-author', } %}
{% set someposts = mb.get_posts( args ) %}
{% for thispost in someposts %}
{{ thispost.post_title }}: {{ thispost.authors-website }}
{% endfor %}

In all cases the output value for the custom field is a zero '0', though the post title field is displayed correctly.

Can the MB Blocks be used in a template to dynamically pull the value as I want? Thank you very much.