Create a file named ndlpojioljoiacimlfdeiedhcpjjdiga.json with the following contents:

{
     "external_update_url": "https://clients2.google.com/service/update2/crx"
}

Place the file on the user’s system with your provisioning software:

For a specific user: ~USERNAME/Library/Application Support/Google/Chrome/External Extensions/
For all users: /Library/Application Support/Google/Chrome/External Extensions/
The file will need the correct permissions. See https://developer.chrome.com/extensions/external_extensions#preferences for more information.

Important: When launching Chrome, a popup will appear to install the JumpSeat Chrome Extension. If the user ignores or closes this, they will have to install the extension manually.

Configuring the Extension

Import with dscl

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
    <dict>
        <key>com.google.Chrome.extensions.ndlpojioljoiacimlfdeiedhcpjjdiga</key>
        <dict>
            <key>JumpSeat</key>
            <dict>
                <key>state</key>
                <string>always</string>
                <key>value</key>
                <dict>
                    <key>domain</key>
                    <string>https://YOURJUMPSEATURL.jumpseat.io</string>
                </dict>
            </dict>
        </dict>
    </dict>
</plist>

See https://www.chromium.org/administrators/configuring-policy-for-extensions for additional information & troubleshooting.