How can we add comments to Sales Order approval email notification on order submit

Summary:

We have a requirement to add comments to the approval notification email during order submit. Currently we were able to figure out below process:

1. Enable comments field in BPM worklist.
2. Create an order by enabling sales order approvals.
3. approval notification is sent to individual/group.
4. Now individual can check the notification button in instance and click on approval notification
5. at the very end, there is a comments section where we can add the comment and approve it.

But our requirement is to capture the comments even before notification pops up during order submit only.

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