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Currently, there is no such feature as editable field in the Grid report.
BUT what you may want to try do instead is Edit the submission and edit the field/data you need to.
You can do the edition in the Submission panel of the form.
You can use the EDIT button to start edit mode. Once you edited the submission, the updated data will also reflect in your Grid report.
Hope this help. Let us know if you need further assistance.