EL Expression to get Custom business Object value and lookup value

Hello Team,

How do we prepare EL expression for getting custom Business Object and look up?

I tried different option like:

#{fndCommonLookup['TEST_SPACE'].lookupDescription['lookupCode']}

#{lookupSets.LookupTypeCode.find('')}

This approach I am planning to use for hiding or unhiding the object using page composer.

I didn't find any documentation regarding the same.

Please let me know if anyone has implemented this any time before or any help would be of great help.