Fact results in event message?

Is it possible to use the result of a fact in the fired event message for a rule? I've searched the documentation, examples and existing issues and not quite found the answer.

The issue does not name a source file, test, or entry point. Start by locating the fact and fired-event APIs in the repository and documentation, then determine whether a fact result can be referenced in an event message. Done means documenting the supported usage, or clearly documenting the limitation if it is not supported.

Written by the indexing model from the issue text.