Single output definition for multiple modules

Hi everyone, hoping some of you can provide me with some insight on using a single output definition for multiple modules.

module.cust1-transfer-server
module.cust2-transfer-server
module.cust3-transfer-server
module.custN-transfer-server

Is there a way to loop over each module and output a value in a single output statement, rather than having to explicitly define an output for every module?