Jenkins plugin: How to access other descriptor

I'm wondering if it is possible to access an other descriptor from a jel开发者_StackOverflow社区ly file (global.jelly)?

The only way to fill data into a textbox, for example, is to use the DescriptorImpl, which is mounted in jelly to descriptor:

<f:textbox default="${descriptor.getName()}" />

But do I need data from another plugin? Is it possible to access this data from a jelly file who doesn't belong to this plugin?