Promo jingle mixing over track

Add to autodj the ability to create a playlist that will run promo-jingle on over track being played (mixed), natively, on a schedule.
At present possible to do only this through an expanded playlist and a separate field in autodj, but this is not convenient:
radio = add([radio,switch([({1m0s or 10m0s or 20m0s or 30m0s or 40m0s or 50m0s or 55m30s) and 0h-23h59},playlist_promovoices)])])