How to write pedal buzz in dorico

Hello,
How do I write this notation which I have found to be a way to notate pedal buzz for harp?

Best,
Laura

It is possible to enter all 4 notes in a chord, and Dorico will automatically split the stem. But currently it won’t do the centered stem with two angled parts. So if Dorico’s split stem doesn’t have the same meaning in harp notation, you would have to hide it and draw your own with several lines or an imported graphic.

The closest symbol to the Z with || you’ve drawn that I’ve found is U+E69B in Bravura, the Salzedo symbol for metallic sounds on one string. If that’s not correct for this use, you’d have to design your own and import that as a graphic too.