Woocommerce composite products input field

Hello! I need help with: Composite Products

Website URL: https://gesundviel.de/produkt/spagyrik-mischer-nach-themen

I need to use a product where the user can enter some text in an input field inside the composite product. How can I achieve that? I have been trying for several days now and used different plugins but the input fields are never shown inside the composite product.

Can you help me or suggest a plugin that works?

René from devbite