How to make a dynamic wordpress comment form?

Question

WordPress

I currently have the simplest form of comments inserted into comments.php as HTML code. It is available in two versions: for registered. users and non-registered users. For non-registered users, an additional block with a registration and login button is displayed.
To the topic:
You need to "fancy" this form: add shortcodes, emoticons, etc. No plugins work on it, since it is displayed through pure HTML and PHP, and not through comment_form.
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