Customizations around dynamic variables in mock server

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My question:

How can I extend the dynamic variables in the saved example of mock server
Details (like screenshots):

I get the dynamic variables to generate the random data in the mock server but I have a bit of different requirement where I need to generate the custom data, e.g. generate the integers in increasing sequence or store the random integer in variable and refer the same at mutliple places.

How I found the problem:

I’ve already tried: