Contracts can request that certain storage slots are initialized to specific values. These initialized slots are represented in JSON format as an array where each element represents a storage slot and has the following properties:
"key": String, a 32-byte key for a given storage slot;
"value": String, a 32-byte value that initializes the slot;
For instance, the following is a JSON object that requests that the 3 storage slots with keys 0x11..11, 0x22..22, and 0x33..33, are respectively initialized to the values indicated.