Verifying already compiled upgradable proxy contracts on other chains

[frangio]

For more context see my previous comments about Mumbai in: Help me to verifying proxy contract in Mumbai Testnet Network

The proxy contracts are taken from OpenZeppelin Contracts 4.1.0.

The compiler was 0.8.2 and settings are found in hardhat.config.js.

Here is the Solidity standard JSON input that was used to compile the proxies:
input.json