If you really mean single
SMALL LEDs, you may be able to power them directly from the DIO ports (check the current requirements of the LEDs and the current providing capacity of the ports), and you could program some duty cycle dimming in your periodic functions for them. If you have a higher current draw requirement but are willing to give up on the dimming, you could use small 5V or
12V relay modules, switched from DIO or relay ports.