Copy contents of a Table Cell to an Input box

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From docu:

Note
If an element is connected to a dataset, setting the element’s value in code does not set the value of the connected field in the dataset. That means if you use the dataset to perform a submit, the value changed in code is not reflected in the submitted item.
To submit the new value using a dataset, set the field’s value using the setFieldValue() function before performing the submit.