This is currently not easily done. There are two options...
1 - You can work with Jonathan or Evgeni on a highly complex customization to see if it is possible to do, but not sure a format of 3 / 57 would be possible.
2 - Escalate as a feature request to provide a field for...
of Related Items (for current object - i.e. Task)
Text or Text Area field that shows all of the related items in one field.
Let me know how you want to proceed.