How to call child DMN from parent DMN

Hi,

I have multiple DMN and I want to trigger all those using one parent DMN. I just want to return the output from all child DMNS. And here my dmn return multiple type of output like list and map.

This is how my flow looks

I have tried configuring literal expression for parent DMN but it didn’t work and I’m getting null as output. I have also checked triggering each DMN and I’m able to get response successfully from each DMN

Thankyou for the help!!!