This plugin fetches deployed contract source code from Sourcify by providing network name and contract address

npm install --save-dev hardhat-sourcify-fetch

And add the following statement to your hardhat.config.js:

require("hardhat-sourcify-fetch");

Or, if you are using TypeScript, add this to your hardhat.config.ts:

import "hardhat-sourcify-fetch";

This plugin creates task fetch which accepts two mandatory params: --network and --address