Struggling with usage of Merge function

Hi,
I am trying to pass 2 dicts/arrays to the merge but I am not able to figure out how to do that. Can I get some help here please?
I tried various things but I can only get this to work.
`print(jmespath.search('merge(`{"a":"b"}`, `{"a":"c", "b":"z"}`)', {}))`

What do I do if I need to pass arguments? Like I have these 2 dictionaries.
`
one = {"a":"b"}
two = {"a":"c", "b":"z"}
`
What am I missing?