Sound output via headphone jack and HDMI simultaneously

Raspi 4 (4GB), Dietpi (current version) and Kodi (Matrix)

is there a easy way to have sound output in headphone jack and HDMI (and usb-sound-card gladly also) simultaneously ?

Generally there is a “multi” plugin for ALSA which allows this:
But I’ve never tested it. The system wide also config is at /etc/asound.conf.

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Thank you for this hint! It seems not to be a easy way, but I will test it and post result afterwards.