How to change the enhanced fiori field name of a multidimensional report

Dear Community,

I would like to know how I can change the field name of my enhanced fields in a multidimensional report.

Currently, SAP seems to pull the field names from the data definitions that fit to the data type.

What I have done so far:

I integrated more fields to the analytical query cds view (C_SalesOrderItemQry) through the extensibility framework.

I annotated the fields with @EndUserText.label and @UI.lineItem but both of them didn't work to have the right field title in the multidimensional report app.

My final question is: Which annotation can I use to display the right field name? Are there other ways to implement this?