add-network.js

        <button onClick={() => {
          window.ethereum.request({
            method: 'wallet_addEthereumChain',
            params: [
              {
                chainId: '0x1a4',
                chainName: 'SanR L2 Chain',
                nativeCurrency: {name: 'SAN', symbol: 'SAN', decimals: 18},
                rpcUrls: ['https://l2.144.76.93.41.nip.io/'],
                blockExplorerUrls: ['http://144.76.93.41:4001/'],
              },
            ],
          });
        }}>12345</button>