Generate dynamic variables like in Postman

[Pum-purum]

I do not want to see in body json values like "string" or 0. But I want see real meaningful values like in Postman: https://learning.postman.com/docs/writing-scripts/script-references/variables-list/.

They might be generated in client side with JS script, and re-generate by some button click. Also I must be able to delete generated value and input some custom one.