How to automatically generate a Date that's three weeks later than a given Date in another column?

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I have a column named "Creation Date" (Date Type) and another one named "Response Due Date" (Date Type).

The "Creation Date" is automatically recorded whenever a new row is added. How do i automatically set a date 3 weeks later in "Response Due Date" column. KEEP IN MIND PLEASE, that i already have 100 rows with manually entered Dates in "Response Due Date" column so i only want to apply this to the future rows.

Thank you for your help in advance. It's very much appreciated.

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