I know you can use kendoSchedulerTimeSlotTemplate like below, but this will apply text to all slots, and it doesn't have any access to the resource/grouping information, only date information is available?
<ng-template kendoSchedulerAllDaySlotTemplate let-date="date">
<strong>{{ date | kendoDate }}</strong>
</ng-template>
Is it possible set slot text on specific slot only like attached image?