How to change the field type on API Call response?

I am defining an API CALL response. After all definitions are created, I click on "Test API Call" to get the JSON response. That´s OK.

My JSON response has several fields. A part of it is this:

Each field is an array of decimal numbers.

The JSON Paths shows a lot of type fields correctly, but these fields are "Anything":

And I want to change it to an array of Doubles. But, when I click on this button to adjust, I see this screen:

I can´t change the type.

How can I do it?