Full class at https://github.com/alexstyl/Memento-Calendar/blob/develop/android_mobile/src/main/java/com/alexstyl/specialdates/dailyreminder/AndroidDailyReminderViewModelFactory.kt

summaryViewModelFactory.kt

    override fun summaryViewModelOf(viewModels: List<ContactEventNotificationViewModel>): SummaryNotificationViewModel {
        val title = NaturalLanguageUtils.joinContacts(strings, contacts, MAX_CONTACTS)
        val label = strings.dontForgetToSendWishes()

        val lines = arrayListOf<CharSequence>()
        viewModels.forEach { contactViewModel ->

            val boldedTitle = SpannableString("${contactViewModel.title}\t\t${contactViewModel.label}").apply {
                setSpan(StyleSpan(Typeface.BOLD), 0, contactViewModel.title.length, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE)
            }

            lines.add(boldedTitle)
        }

        return SummaryNotificationViewModel(
                NotificationConstants.NOTIFICATION_ID_CONTACTS_SUMMARY,
                title, label, lines
        )
    }