yes there are ways to export markers using midi or EdiMarker (free)
only one marker track supported
Only single markers (not cycle markers)
a-z -0-9 supported IIRC (no umlauts)
It still won’t help that much as the Edicue/Ediprompt naming conventions is quite particular. It’s been a long time since I tried it but it is very different to how we do it in Nuendo.
I think your best bet is to get a Edicue trial (or rent it perhaps) I think that way you can export your marker data as csv and reformat on import to EdiCue.
I have done a intermidiate step for PT ADR studios so that we create dummy clips for each character in Nuendo as a AAF. With some extra third party scripting you can even push your marker data to the descriptions on those clips (probably not worth the effort for a single or small jobs, if you see a lot of them in your future it may very well be worth it).
However this is made for studios that DO NOT use EdiCue/EdiPrompt. If they do they have to format the prompts at the studio, I will then supply a csv with the data for them to deal with.