possibility to expand text for a list/rawlist choice

[Eken92]

When having a list with options that "hides" a lot of information within them, is there a way to build a trigger for some kind of "help"/"description". Something like an option to "expand" a list choice.

Let's say I have the following rawlist:
? Select rule

1. rule1
2. rule2
3. rule3

Then I would like to know what the "conditions and actions" are for that rule. So, if I arrow down to rule 2, then by pressing ctrl+e (expand) - or so, then additional text would be provided after that option (providing a string as return value). Like this:

? Select rule

1. rule1
2. rule2
   -- No candy on friday
   -- No tv after 22
   ++ Gets a big ice cream by the end of the week
3. rule 3

Would this somehow be possible? Would be a really cool feature.