Extensible list with two columns in form

Hello All,

This is rather an implementation question.

I need to achieve a two column extensible table to be included in a custom entity form.

Let's say entity is a repair log, I need a table for that I can add replaced parts and quantity.

Eg:

Name: Repair 1

Replaced parts:

3 pcs | screw

1 pcs | main unit

4 pcs | rubber

The replaced parts will be exclusive for the given repair log hence custom entity for replaced parts wouldn't be a good idea.

Is there any way to achieve this beside a multiple line text box with separating entries with comma?

Thanks