Missing fields in Autocomplete Rules

Summary:

We need to limit the characters for certain fields, but we cannot find some of them and the fields below are just one of the few example.

Is there a way to add a validation using Autocomplete Rules since the page is not yet transitioned into Redwood Page?

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

26B

Code Snippet (add any code snippets that support your topic, if applicable):