The FormatString property editor doesn't support custom formats. We will remove the ability to set them from the property grid. Use the Template to specify custom format.
But it works for me at the moment 
Does this mean I have to write ${data.Created | utcDate:"yyyy-mm-dd HH:mm"} everytime?
I would like to do this change on very much files. I would like to use some string which doesn't need to reference a different fieldname everytime. Is this possible somehow?
Didn't even know it worked with custom values 
I guess we will leave it as it is - just make the dropdown a textbox if it is a custom value.
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