Report Builder 3.0 - Custom legends

Hello,

I'm new to this forum and also to SSRS / Reporting Services.

I'm currently building a report using Report Builder 3.0. I have made a pie chart where I wish to add custom legends (I've found the field). More specifically I want to add both a custom text and a value from a field, for instance "Work: 3465,67". I've fiddled a bit with different expressions but none seem to work.

Any advice?

Thanks