Populate page name in multi-page form

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How to populate page name (of the first page) in a multi-page form?

I successfully managed to populate field labels with the following function:

add_filter('gform_pre_render_1', 'populate_custom_field_label');
add_filter('gform_pre_validation_1', 'populate_custom_field_label');
add_filter('gform_admin_pre_render_1', 'populate_custom_field_label' );
add_filter('gform_pre_submission_filter_1', 'populate_custom_field_label');
function populate_custom_field_label($form) {
    foreach ($form['fields'] as &$field) {
		$post_id = get_query_var('training');
        if ($field->id == 30) {
			if ( $post_id === 329 ) { 
				$field['label'] = 'Thuisstudie';
			}
			else {
				$field['label'] = 'Training';	
			}
			
        }

So I think the code should be something similar:

add_filter('gform_pre_render_1', 'populate_page_name');
add_filter('gform_pre_validation_1', 'populate_page_name');
add_filter('gform_admin_pre_render_1', 'populate_page_name' );
add_filter('gform_pre_submission_filter_1', 'populate_page_name');
function populate_page_name {
		/*$page = How to get first page???*/
		$post_id = get_query_var('training');
        if ($page == 1) {
			if ( $post_id === 329 ) { 
				$page['label'] = 'Virtual training';
			}
			else {
				$page['label'] = 'Classroom Training';	
			}
}

Don’t know how to call/get the first page name. Anyone who can help me?

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