Save RG to multiple entry list field

Is the registration of an order with a shopping cart.

I would like to be able to store the complete RG list in a list field.
If it is not possible to save a complete list with the columns, there could be a way to concatenate the data as an example: “2x Banana R $ 6.00” and save line by line, as long as it is in the same record.
I’ve tried everything and I couldn’t

I’ve done it.
After a lot of trying and also looking here in the forum and just seeing the unanswered questions I leave the solution here for those who come looking for it later.