How can I create scoped environment variables in my Jenkinsfile?

The Jenkins credentials plugin provides a withCredentials function that can store the value of a credential into a scoped environment variable as seen here.

node {
  withCredentials([usernameColonPassword(credentialsId: 'mylogin', variable: 'USERPASS')]) {
    sh '''
      set +x
      curl -u "$USERPASS" https://private.server/ > output
    '''
  }
}

I want to write a groovy method we store in our Jenkins vars shared library that does something similar; a list of pairs for an ID to operate on and the name of an environment variable to store that ID within scope of the function. Something like

withMyOwnVars([
    ['some-input', 'VAR_NAME'],  // Value of VAR_NAME will be set under the hood somehow.
    ['another-one', 'VAR2']
])
{
    print("$VAR_NAME")
}

Does Groovy provide this functionality?