Welcome to the community, @omario! You could do the same with different approaches in KoBoToolbox.
Approach 1: Other
You could do it through the other
in a mutliple_select
question as outlined in our support article User-Specified “Other” Responses for Multiple-Choice Questions. We also have a suitable workaround in the community that should suit you very well:
Approach 2: Matrix Question
The other approach is using the matrix question. This support article Question Matrix Response Type should help you solve your issue. We do have a workaround in the community that should help you: