Getting and put all secret in an env file on Jenkins and hashicorp vault

Currently we are building a jenkins deployment pipeline. On those build, for secret management we are using HachiCorp vault. For getting secret we using hashicorp-vault-plugin. Problem is we wants to declare all variables on pipeline scripts, like this - testing','testing_again', secret/another_test (we don't want that)

node {
    // define the secrets and the env variables
    // engine version can be defined on secret, job, folder or global.
    // the default is engine version 2 unless otherwise specified globally.
    def secrets = [
        [path: 'secret/testing', engineVersion: 1, secretValues: [
            [envVar: 'testing', vaultKey: 'value_one'],
            [envVar: 'testing_again', vaultKey: 'value_two']]],
        [path: 'secret/another_test', engineVersion: 2, secretValues: [
            [vaultKey: 'another_test']]]
    ]

    // optional configuration, if you do not provide this the next higher configuration
    // (e.g. folder or global) will be used
    def configuration = [vaultUrl: 'http://my-very-other-vault-url.com',
                         vaultCredentialId: 'my-vault-cred-id',
                         engineVersion: 1]
    // inside this block your credentials will be available as env variables
    withVault([configuration: configuration, vaultSecrets: secrets]) {
        sh 'echo $testing'
        sh 'echo $testing_again'
        sh 'echo $another_test'
    }
} 

But need some things like this -

1. Get all the secret as key and value
2. Put on a env file before Building the project
3. After build project, destroy the env file.

Is it possible by jenkins hashicorp-vault-plugin Or get those secret from vault by curl and process by shell commend (Example is great).