Alert Composer Tokens are not Populating for Journeys

Hi Team,

We are building an Alert Composer Notifications for Journeys, but we are not able to find list of Tokens from drop down list with in Alert Composer for Journeys.
Path: Tools > Alert Composer > Journey Assigned > Add Template > Edit > Add Recipient > Expression

Kindly suggest, do we need to make any set-up or enable any Profile option, etc.?

Please find below screen shot for reference.

Regards,
Mastan.