any with the output of coalesce

I am trying to create an expression which
- always yield true if the incomming array is NULL
- yields true if a given value is in the array, otherwise yields false

I thought this should work:
Select 'target'=ANY(COALESCE('{indata1, indata2}','{target}'))

but I get an ERROR: op ANY/ALL (array) requires array on right side
Can somebody tell me what I am doing wrong and how to do this right?

Thanks for the help.
Balázs