magento2 – How to add a PHTML template file with Magento 2 custom payment step?

I've seen that this new step can be added with the Knockout JS HTML file. Is there a way to attach a PHTML template file instead of HTML or JS?

                                        Magento_Checkout / js / view / user-login
                                                Magento_Checkout / js / view / form / element / email
                                                Magento_Checkout / form / element / email
                                                connection methods
                                                    We will send your order confirmation here.
                                                        form before login
                                                        additional login form fields

Any help would be appropriate.