NiFi Expression Language: How to Check if a Variable Exists in an Array Using anyDelineatedValue

I have two flow file:

1) $.category = sport

2) $.temp_array = "music" , "sport" , "traveling"

I just want to check $.category is exist in $.temp_array or not using in expression language.

Ex.

${category:in(${temp_array})}

But it doesn't work with array or (variable). I have used this login on RouteOnAttribute processor. Instead of above example if i write like this:

${category:in("music","sport","traveling")}

then ii will give you perfect output But this is static data. Instead of this i want to use dynamic.

Please help.