Extend / override declarative pipeline syntax

[gregory...@gmail.com]

Hi List, 

Is there a way to extend or override declarative pipeline syntax ?

I would like to be able to provide a library I would use this way :

pipeline {

  agent any

  tools { ... }

  stages {

    stage ("My custom stage") { ... }

    standardStage()

    stage ("My custom stage") { ... }

  }

}

where standardStage would be defined ilike this :

def call() {

  stage("Standard stage") { ... }

}

which is not possible because of declarative pipeline syntax check ("standardStage" is not a legal child of "stages")

Thanks in advance,

Grégory