not my wallet !
i need all walletS with their amount from blockchain
What do you mean about this "not your wallet"?
Do you mean that you want is a watch-only wallet only just to monitor the balances of your wallets(That you can check from time to time)?
Public key or addresses is enough to monitor them just import the public key/addresses to any wallet that support watch-only wallet like Electrum.
Or do you mean that you want to backup those wallets?
You can also make backup funds from Blockchain app on the mobile phone by going to the security section or menu where you can find the "
Backup Funds"
Source: https://support.blockchain.com/hc/en-us/articles/209564506-Make-a-Wallet-Backup