I want to add a hidden field to replace ‘application’ but struggling

I am using ot for a small recruitment startup. Low on cash after the lockdown so cant afford a programming team.
I want every application form a candidate to go to the same email address where I have written a parser to fill the form and extract data etc in outlook.
I want a simple <input type=’hidden’ name = ‘application’ value=’[email protected]’>

Ive tried filters changing the type to hidden:

/********************************************************************************
* Create a hidden fiedls hold the url of application form
*********************************************************************************/
function hidden_application_field( $fields ) {
$fields[‘job’][‘application’] = array(
‘type’ => ‘hidden’,
‘value’ => ‘[email protected]’,
‘priority’ => 7,
);
return $fields;
}

Nothing I have tried creates a hidden field.
At the moment I get a blank where the application field used to be, but no errors.

Any advice would be really great.