Extend "loop.item" to show corresponding item

I try to make a widget using an oh_repeater component.

the loop.item’s of the group are “switch items” named like “FS01_lifeCheck” or “RS01_lifeCheck”.
As a title I like to show the loop.item and the timestamp state of the corresponding item named “FS01lifeCheckTimestamp”
How can I manage it to get the “loop.item+Timestamp” state?

slots:
  default:
    - component: oh-repeater
      config:
        for: item
        fragment: true
        groupItem: =props.lifeStatus
        sourceType: itemsInGroup
      slots:
        default:
          - component: oh-list-item
            config:

 ----->      title: =loop.item.label + "----> (" +[loop.item.name+"Timestamp"].state + " )"

              badge: =loop.item.state
              badgeColor: '=loop.item.state === "OFF" ? "red" : "green"'
              icon: '=loop.item.state === "OFF" ? "f7:battery_0" : "f7:battery_100"'
              iconColor: '=loop.item.state === "OFF" ? "red" : "green"'

items[loop.item.name+Timestamp].state I think should work.

In addition, you probably don’t want to use just

loop.item.state

in your epxressions. That is a static representation of the state at the time that the repeater made its call to the API and not a dynamic value. If you want your widget to respond to changes in the item as well then you should use

items[loop.item.name].state

instead.

Thanks Rich and JustinG
works well with little adaptation

items[loop.item.name+“Timestamp”].state