schema variables

can you help me ?

i used gpt and gives me this code :

// Define your data object
$data = (object) wp_parse_args(
$data, [
‘match_id’ => “”,
‘kickoff’ => “”,
‘match_time’ => “”,
‘match_date’ => “”,
‘home_name’ => “”,
‘away_name’ => “”,
‘home_logo’ => “”,
‘away_logo’ => “”,
‘home_goals’ => “”,
‘away_goals’ => “”,
‘home_penalty’ => “”,
‘away_penalty’ => “”,
‘status_meta’ => “”,
‘status_id’ => “”,
‘competition’ => “”,
‘commentator’ => “”,
‘channel_name’ => “”,
]
);

// Function to retrieve custom variable value
function custom_variable_callback($data_key) {
global $data;

// Return the value of the custom variable
return $data->$data_key;
}

// Register custom variables
add_action(‘rank_math/vars/register_extra_replacements’, function () use ($data) {
// Loop through each key in $data and register custom variable
foreach ($data as $key => $value) {
rank_math_register_var_replacement(
$key,
array(
‘name’ => ucwords(str_replace(‘_’, ‘ ‘, $key)),
‘description’ => “Value of $key from the data object.”,
‘variable’ => $key,
‘example’ => “custom_variable_callback(‘$key’)”,
),
function() use ($key) {
return custom_variable_callback($key);
}
);
}
});

it works and i found it in rank math
but when i insert it in schema template it displays nothing
https://ibb.co/LQDLVQ6
https://ibb.co/tD83Lfj
https://ibb.co/4KdhGCY

any help ?