Can we have custom repeating element in for loop?

Summary

In ICS for loop, I want to customise the repeating element

Content

Context: A sales order can have multiple items, instead of looping through all the items in the response, I want to look for specific item and fetch it's details.

Can I customise the XSLT to achieve this? currently the 'Repeating element' window isn't allowing me edit.

Is there any way around to achieve this.