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I understand that you want to set required option for individual cells/a row of a matrix field. This is possible by selecting the option 'Require an answer on every row' for Required option from the Matrix field properties.
Hope this information helps! Let us know if you need any further assistance. We will be happy to help.
Thanks for your reply! It is not exactly what I ment though, I ment it for one row only.
If this is not possible, this will work too.
On be half of my colleague, you are welcome.
Unfortunately, we cannot require a specific row or cell of the Matrix field at the moment.
If you have any further questions, please let us know.