Add support for `raw` variables

What does this MR do?

⚠ Blocked by !1789 (merged). Change the target branch to master after !1789 (merged) is merged.

Why was this MR needed?

Are there points in the code the reviewer needs to double check?

Does this MR meet the acceptance criteria?

• Documentation created/updated
• Added tests for this feature/bug
• In case of conflicts with master - branch was rebased

What are the relevant issue numbers?

Closes #4696 (closed)