How to add an input field into a 2-step order form

Do you want to add an additional input field into a 2-step order form in ClickFunnels?
Well it looks like it only possible with custom coding.

What is the simplest solution for this?

You need to create your own order form by choosing various elements from the order as well as some additional input fields.
See this video here: https://d.pr/v/ZbWKUO