Add a custom action button in WooCommerce admin order list

I have followed this instructions to add a custom order status for my WooCommerce Orders.

I can't find a way to create a custom action button that changes the order status to my custom status from the admin order list page like this screenshot:

I would like this custom action button to be shown for the orders that have a "Processing" status.

I could not find any answer in WooCommerce documentation.

Is there a hook to apply these buttons?
How can I add it in the function.php?

Thank you