How to export raw encryption private key

I’m a vault beginner.
I want to manage encryption keys by Vault with no lock-in but cannot find api to export raw key.
I created key by vault write -f transit/keys/orders
And I can read metadata by vault read transit/keys/orders

Then how to read raw key?

I found solution. ‘exportable’ parameter and ‘export’ path.

vault write transit/keys/mykey exportable=true type=aes256-gcm96
vault read transit/export/encryption-key/mykey