Get UserId when drag and drop chat

I want the userid when I "drag and drop" a chat somewhere from direkt messages to a browser or an application or something. 

I know I can get the pictureId and userId if the user has a picture, but I cant if the user doesnt have one. I can only get the channelId what dont really helps me.

Should be pretty easy to add something like that:

before
<a class="link-39sEB3" aria-label="Lowa (Direktnachricht)"...

after
<a class="link-39sEB3" userId="216604763003813888" aria-label="Lowa (Direktnachricht)"...