With a little bit of help from ChatGPT, I have come to a solution!
I’ll write it down in case it can help someone in the future:
Step 1. Create a PHP function to check if a Post has _bricks_template_type equals to content.
// Function to check if a post has the "_bricks_template_type" meta field
function has_bricks_template($post_id = null) {
if (!$post_id) {
$post_id = get_the_ID();
}
if (!$post_id || !is_numeric($post_id)) {
return 'false';
}
// Get the value of "_bricks_template_type"
$template_type = get_post_meta($post_id, '_bricks_template_type', true);
// Check if it exists and equals "content"
return ($template_type === 'content') ? 'true' : 'false';
}
Step 2. Register the custom function to be able to use it in {echo} tag
// Allow the function to be used in Bricks conditions
add_filter( 'bricks/code/echo_function_names', function() {
return [
'has_bricks_template',
];
} );
Step 3. Add a condition to the element you want to show/hide based on the existence of Bricks content
Condition: {echo:has_bricks_template} == true
If someone has a better solution, please let me know! 