You can change how quickly or when Siri responds, use text to make requests to Siri, have Siri listen for atypical speech patterns, have Siri audibly share notifications, and announce and end calls.
Go to Settings > Accessibility > Siri, then turn on Type to Siri.
Note: If you have an hearing devices.
Go to Settings Change Siri settingsUse Voice Control commands to interact with iPad