Is your feature request related to a problem? Please describe.

For many resources in CloudFormation, a property block can be defined as a JSON string, rather than a nested block. This makes it impossible to inspect a specific sub-property and enforce a ruleset against it.

Describe the solution you'd like

Add a set of in-built functions that could perform a text-based manipulation, which could include JSON parsing, URL encoding/decoding, and a Regex-style replacement.

when %my_variable is_string {
    let my_parsed_variable = jsonparse %my_variable
}

let my_parsed_variable = urldecode %my_variable

let my_parsed_variable = regexreplace /ab(cd)ef/ %my_variable 'zy$1vu'

Describe alternatives you've considered

Something out-of-band probably, or some complex Regex magic if I hated myself enough.

Additional context