Description:
When creating a line chart graph, you can right click the line and "insert mean value line". However it is impossible to inser a data label to this line. You can only insert data labels to the chart line.

Steps to Reproduce:
1. create some data
2. create a line chart from the above data
3. go to chart and right click the line
4. insert "mean value line"
5. try to insert data label to mean value line

It is impossible there is no such option

Actual Results:
It is not possible to add data label to mean value line

Expected Results:
There should be an option to insert data values to mean value line


Reproducible: Always


User Profile Reset: Yes



Additional Info:
Version: 7.0.3.1 (x64)
Build ID: d7547858d014d4cf69878db179d326fc3483e082
CPU threads: 12; OS: Windows 10.0 Build 19042; UI render: Skia/Raster; VCL: win
Locale: en-US (en_US); UI: en-US
Calc: CL