Here’s my rendition of it in Dorico, but I admit this was too much tweaking for such a result, and it won’t play correctly, since I had to write a quarter instead of a dotted quarter and remove rests… Still, it looks as you wish !
The tweaking is just for the first element, the others were just replicated (r) and pitched afterwards.
Here’s the receipe : input a triplet of 8th notes. Change the first into a quarter note, and in the right panel, change it into a 8ths tremolo. Select the rest, remove it (edit menu). In Properties panel, choose not to show the bracket of the tuplet, and move the 3 with X and Y values, in order to have it right above the note as you wish. Select the whole thing and replicate !
