Auto select items in item link tracker fields
On a Tiki22 I have a tracker for parents to select one or more of their children using an item-link tracker field (preselect based on parents name).
Users seems to have issues to select one or several even I added documentation (textual help under the field) - (on mobile they may missed it as it is below). Also I have a few case only one child is outputed as option in the field. Is there a way to "force" auto-select the output, meaning select all available option and hiding empty row ?
As tracker rules or parameter (preferred) ?
Or Javascript ?