No, once a question is added to the survey, the option to import questions from an MS Word file is disabled.
As a workaround, you can save the existing question to the Question Library, create a new survey, import questions from the Word file, and then add the saved question from the library.
Alternatively, you can delete the existing question, import the Word file first, and then re-add the deleted question.
Here’s the help file for saving a question to the Question Library:
https://www.questionpro.com/help/survey-question-library.html