Create a new term

Create a new form and set Post Management as action.

Pick up the desired post Term and leave the Taxonomy blank:

Finally, map the meta fields if needed.

At this stage, you are ready to build the form as desired.

Suppose you want a form to create new category terms on your website like this:

You can render the form everywhere just by using the generated shortcode.

Let's take a look at the form on the Twenty Twenty-One standard theme: