Put an input element on the page…style it so it looks like plain text and check the input is disabled

Screen Shot 2020-12-25 at 12.36.21 AM

Then next to it put the edit icon and workflow for when it is clicked to change a custom state on any element you want and make a conditional on the input element that when met, will change the style to look like an input, will also make it enabled

Screen Shot 2020-12-25 at 12.39.29 AM

You can not dynamically choose the field to update because the field choice is not dynamic…you could set conditionals and create even more development work to have a conditional for each workflow update action to determine which field to update.