Force artist index values

[Knur]

Hello

I'm using a full license.

I would like to have the Artist tag to only contains a concatenation of other tag, like soloist, composer, orchestra, etc. and completely ignore the actual artist tag in my files.

I am able to do that using the tagFormat setting, with :
Artist.displayFormat={$composer$soloist$orchestra$conductor^^^ / }

This works on some of the displays on the renderer (I tried Lumin and BubbleUPNP).
But browsing to the Artist tag (or listing the Albums or Group), I still see the original Artist tag of my file...

I tried the "Artist.indexFormat" approach, but it seems that it doesn't do anything...
What am I missing ?