Thanks for coming on to the forum!
How the parameter-map actually works is it’s a groovy expression see: https://www.baeldung.com/groovy-maps#creatingMaps. So what you suggest would save some time writing the same thing twice, but we don’t really have control over the syntax used there unless we write our whole own programming language.
If you’re interesting in something like that let me know, but it’d take a lot of work and better be very worth it. I wrote a bit about that here: Domain Specific Languages.