Unfortunately not. Since as @wolffcm says in the issue that I opened in github:
Note that it looks for the state names ok , info , warn , and crit . And if it finds a _level that doesn’t match that it encodes that as a 0.
Then we can only use the levels predefined by the function, and we cannot use custom levels as in your case.
@delapuentem thanks for your reply. I asked @wolffcm if there is a way to rebuild the function as a custom function.
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I rewrite the function for my usecase. More infos here.
Maybe this helps someone. 
