To be more specific : On the x-axis I have weeknumber as dimension. Because weeknumbers don't have the same start- and enddate I would like to add the enddate for the most recent year as popup info for every weeknumber.
I cannot find a way how to do that.
Believe that was a SPAM post, getting it looked at, is it possible to provide a screenshot of exactly what you mean, as I am still a bit confused as to what exactly you mean here and screenshot would be very helpful.
I just had a look at the Help:
Under the Chart Properties: Dimensions hyperlink on the right side, and then the Settings for Selected Dimension would be the only settings to try to get something else on the X-axis value I believe, I cannot tell whether anything there is going to work or not, or if you did a label expression if that might work somehow. About the best I can offer other than maybe if someone has done an Extension that might insert some additional functionality for this use case. I recall running across one someone posted not long ago, but I cannot recall the subject to try to find it. Sorry I do not have anything better for you.
There should be a means to put in a feature request though, I believe that went live in the Community yesterday, yeah, here is the link: https://community.qlik.com/t5/Ideas/idb-p/qlik-ideas