Modifier: :field_ids

Limit to these sub-fields. Write it after a colon: {Items:10:field_ids=10.1|10.2}

About

Restricts repeater output to the listed sub-field IDs. Attaches with "=", not ":", and separates multiple IDs with "|".

Product	Gravity Forms
Requires	Gravity Forms 3.0 or later
Works on	Repeater fields
In the picker	Change the output

Where the merge tag picker offers it

Form fields: Repeater.