I have a variable with some common values between `dap-mode` debug templates and I want to use that variable along with other cons elements for `:environment-variable` in languages like Golang or Typescript you would do something like this:

```
variable = [1, 2, 3]
another_variable = [...variable, 4, 5, 6]
```

then `another_variable` will carry the value of `[1, 2, 3, 4, 5, 6]`

How can I do this in Emacs Lisp?

**EDIT:** I know how you can evaluate something inside a list, this is using the backquote, my problem was that I didn't know how Elisp processes lists in a fashion that keep the result plain because, for instance in Python, you can end with something like `[1, [2, 3, 4]]` if `x` is `[1]` and you do `x.append([2, 3, 4])`; I didn't know that `,@` was a thing and that neither `append` keeps a plain list.