With the help of Jonathan at FF, I've found some further information on Stripe.  The attached screeenshot is taken from https://stripe.com/docs/account/statement-descriptors#static.

So, does anyone know how we modify FFPro to send this information to Stripe with the transaction?
Thanks,
Phil.

Hi Phil - Assuming this is a one-time payment, you can try the following example code snippet, and customize as needed. 
Let me know if this helps!
-  Jon

add_filter( 'frm_strp_new_charge', 'stripe_metadata', 10, 2 );
function stripe_metadata( $new_charge, $atts ) {
  // Supports multiple Payment Action IDs
  // Action ID 1234 - One Time Payment
  // Action ID 5678 - Recurring, Monthly
  $form_action_ids = [1234, 5678]; // Replace with your Payment Action IDs
  if ( in_array($atts['action']->ID, $form_action_ids) ) {
    $new_charge['metadata'] = [];
    $new_charge['metadata']['key'] = 'value'; // Replace 'key' and 'value' appropriately
  }
  // Supports single Payment Action ID
  // Passes form metadata and entry metadata to Stripe
  if ( $atts['action']->ID == 789 ) { // Replace 789 with your Payment Action ID
	$new_charge['metadata'] = [];
    $new_charge['metadata']['sourceName'] = $atts['form']->name;
    $new_charge['metadata']['sourceType'] = 'formidable';
    $new_charge['metadata']['source_formId'] = $atts['form']->id;
    $new_charge['metadata']['source_formKey'] = $atts['form']->form_key;
    $new_charge['metadata']['source_formEntryId'] = $atts['entry']->id;
    $new_charge['metadata']['source_formEntryKey'] = $atts['entry']->item_key;
  }
  return $new_charge;
}