I have seen that it is possible to define a lot of different custom fields to put in different sections, but I havent been able to find out if it is possible to create your own custom section.
What I'm thinking of specifically is a custom section called 'Test Details' which appears right under the 'Description' section. And then in here we could put a multiline text field where users could fill out Test Steps as a numbered list.
A very basic version of what different plugins provide, for example as shown here:
bb97a5a5-43b6-498e-a844-22a424056df3.png