Text Formatter problem pls help

I had an example with a dictionary where they wrote
{dictionary({key} - {value})}
which gave a list of the key,value pairs
I want to get *only* the value of a specific key. How do I do that?
I tried
{dictionary['MyKey']}
but that gave me
MyKey']}

How to do...?

Ah...found it:

{keyvalue(MyKey)}