[Config] How to add variables/constants to rc

Is there a way to add variables to the config file?

Things like recurring numbers would be nice to declare once and use for any command where I want to change padding, sizing, grid etc.

Thanks

No file, test, or entry point is named. Start by locating the configuration parser and reviewing the current rc syntax, then determine how reusable values would interact with padding, sizing, and grid settings. Done requires an agreed syntax and behavior, including how declarations, reuse, and invalid values should work.

Written by the indexing model from the issue text.