Hi Daniel,
While we can pull the text added on the copyright field by getting the value of get_theme_mod( 'generate_copyright' ), I’m not sure that’s practical when we can just edit the Global Footer directly and copy+paste the contents of what’s added on the copyright message added on the customizer.
We can display its value using a shortcode.
example:
add_shortcode( 'fetch_copyright_field', function() {
ob_start();
// Start your PHP below
echo '<span class="generated-copyright">'.get_theme_mod( 'generate_copyright' ).'<span>';
// End your PHP above
return ob_get_clean();
} );
And use the shortcode [fetch_copyright_field] on a shortcode block but this seems like unnecessary extra steps as you will have to do custom CSS styling to this.