My idea is basically the same as this post.But I can't reply to it.
https://community.qlik.com/t5/Suggest-an-Idea/Allow-custom-label-on-master-items/idi-p/1497626
The introduction of expression based label in master measure is great. But it would be nice to be able to overrule the label within a chart. Similar how you are able to overrule the master formatting.