How can I lock/unlock individual cells in a row, without locking the whole row or whole column?

I am developing a "approval" workflow Smartsheet.

Selected approvers need to update certain columns in a newly added row, but other columns must be kept locked until "their turn" comes to be opened for update, contingent on the approval of the previous approvers

So locking a whole row, or a whole column will not do the trick as it will interfere with the sequential hand-off of approvers - all working on the same row.

Is there a way to accomplish this in Smartsheet?

Thank you, so much for your guidance.

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