It would be a great benefit to be able to load a pre defined Jenkins shared library in Jenkins. 
for instance constant classes that are defined in the shared library could be useful to be used within the Job definition 

1- within the job dsl definition

e.g. a job dsl file:

@Library('jenkins-shared-library') _

import com.name.Test.Conf

pipelineJob('Test')

{ description(Conf.DESCRIPTION) . . }

 

 

2- within the importable classes accessible to the job script 

for instance in the repo there is a

job.groovy

Foo/Bar.groovy 

 

in Bar.groovy it would be possible to import classes from Jenkins shared library (assuming @Library used in the job would already load the library, making its classes importable by the job accessible classes)

content of Bar :
package Foo

import com.name.Test.Conf

class Bar

{  Public final A = Conf.VALUE Public final B = 'test' }

 

contents of job.groovy:

@Library('jenkins-shared-library') _

import com.name.Test.Conf

import Foo.Bar

def local = new Bar()

 

def C = local.B

pipelineJob('Test')

{ description(Conf.DESCRIPTION)   C used in the job anywhere    . . }