Record Summary Template - can we use deluge script?

Record Summary Template - can we use deluge script?

Hi,

I have created a Record Summary Template using the template builder. While showing a record I would like to show other record from different table which do not have any link to the current record/table. I tried to look for a way to insert deluge script but could not find a way to do it (no script builder button or template definition section).
Is there anyway to use deluge script in Record Summary Template? 

Thank you,

Pambudi