As the title of question, I just want to access data saved in keychain on iPhone from Apple Watch. Can I do that? and how?
Your items are stored securely in the Apple Watch Keychain When you add items to 1Password on your Apple Watch, all the details from the item are added to your watch. Because the details are stored in the Apple Watch Keychain, they're protected by your Apple Watch passcode, not your account password.
iCloud Keychain can also keep the accounts you use in Mail, Contacts, Calendar, and Messages up to date across all your iPhone and iPad devices and Mac computers.
View saved passwords and passkeys in SettingsTap Settings, then select Passwords. In iOS 13 or earlier, select Passwords & Accounts, then tap Website & App Passwords. Use Face ID or Touch ID when prompted, or enter your passcode. To see a password or passkey, select a website or app.
Since watchOS 2.0 sharing keychain items between the watch and the paired device is no longer possible. The watch and the paired device are considered independent now. One can use WatchConnectivity as a workaround.
https://forums.developer.apple.com/thread/5938
The Watchkit app is an extension that is running on the paired phone, so you can share Keychain data in the same way as you can share keychain with any other extension - by activating "Keychain sharing" in your applications capabilities.
See Share between an iOS extension and it's containing app with the keychain?
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