Custom state elements in the Jenkins singleton

[Kamil Dzierżanowski]

In the init scripts, I'm using Grape to get com.bettercloud:vault-java-driver:4.0.0. It is then used by creating an instance of the Vault client, such as:

def vaultConfig = new VaultConfig()
  .address(vaultUrl)
  .token(vaultToken)
  .sslConfig(new SslConfig().build())
  .build()

Integer vaultEngineVersion = 1
def vault = new Vault(vaultConfig, vaultEngineVersion)

I'd like to persist the vault variable shown above across various init scripts that will be executed after this. Is there a mechanism to write custom objects as state of the Jenkins (or any other) singleton?

Thanks,

Kamil