How to add Yandex.Metrika to the form submit button in joomla in the Fox Contact Form module?

Question

Joomla

Tell me how to add Yandex.Metrika to the submit button of the form in joomla 3 in the Fox Contact Form module ? It is necessary to be able to create different code for a specific form, there can be up to three such forms on a page. Through the theming of the template, you can set your own design template for a specific form, but in it the entire form is displayed through one variable and, accordingly, you cannot hang up an event for sending.