How to have free text and radio button response on the same question?

Hi there,
I'm looking for a workaround to have free text (numeric) and a radio button on the same question.
E.g. ask respondents what year they graduated, but also have a 'can't remember' option to select.
I have found that you can do this with multiple choice question, making one response allow text, but you have to select the radio button to enter the text (see attached image). Ideally, respondents should just be able to directly enter text without first having to select the radio button.
Thanks for your help!