kofu: How to reference another bean into a value in a DSL configuration block

[cheroliv]

here is a project I put to document my issue kofu-sample
How do you do to refere to another bean in the configuration block, of a kofu project.
here is my configuration file where I try to make that reference I commented the line where I try to make that reference (line 57 in gist)
here is a gist of my configuration