No, assets cannot be added manually to the Jupiter Extension Wallet.
Your portfolio automatically updates based on the tokens you hold - whether you swap within the app or on jup.ag, or receive tokens from another wallet.
https://support.jup.ag/hc/en-us/p/get_started
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Create a wallet & make your first trade
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https://support.jup.ag/hc/en-us/p/faq
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