Block definition question - maps

Hello,
I am actually trying to create an aws wafv2 rule group, nut this is generic.

In the race was, I can find a blocker which contains an unknown number of fields and values. This feels depends on the managed rule I want to configure. Ask this value I’ve not known and must be customizable, I have to use a map valuable to store the desire settings.
Is there a way to define a block with the content of a map line if I try to use the sign to set the block value, I get an error, but I cannot find anything about setting the block content when I know nothing about it.
To be precise, this block will be a dynamic block.