Hi @Hannes_Kerschbaumer, since playback would be impossible in such case, one very comfortable way is to use customised lines (with invisible body and with start end repeats glyphs as start and end caps) attached to barlines and positioned inside the staff. So you are free to put them wherever you need without any problem.
…I did an example some times ago. Lets see if I can find it…
And I found my example. You can find the line in the Lines editor, it is called cgr repeat start and ending, with the two connected annotations (you can save them all as default if you wish to use the line I made 
):
Dorico file (the line in this example line is attached to the barline on the left and to rhythmic position on the right) :
repeat and end as line.dorico (1.4 MB)
Edit: Please notice that there is a better method for creating the invisible line body. See post #6 below.
For reference, here the original thread where this workaround was discussed (the method was suggested by @jesele I believe):
[click on the blue text to go to the whole thread]