Collecting Dates in a Reoccurring Approval

I have a sheet that needs to be reviewed and approved by multiple individuals on a regular reoccurring basis. I have already set up the workflow for this to happen but I will need to keep a list of the dates they were previously approved. Is there a way to use a formula like Join/Collect to do this?

When I try it will just over write that is in the cell to the new date value. Below is what the sheet looks like.


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