Workflows - Posting a Card

I'm in the process of migrating our Jira integration with teams from using the soon to be deprecated Connectors, to Workflows. I have two problems that I can't see to overcome.

1. All the messages are posted as '[My Name] via Workflows posted a new message'. Is there any way the message can come from another user or no user?

2. The preview for the messages (in the notification popup and Activity screen) is 'Card', instead of anything useful.

Together this makes the notifications not very useful.

What I have done:

The workflow is set up

And what is being posted to the webhook is (for example).

{
    "type": "message",
    "attachments": [{
            "contentType": "application/vnd.microsoft.card.adaptive",
            "contentUrl": null,
            "content": {
                "type": "AdaptiveCard",
                "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
                "version": "1.4",
                "body": [{
                        "type": "ColumnSet",
                        "columns": [{
                                "type": "Column",
                                "width": "auto",
                                "items": [{
                                        "type": "Image",
                                        "url": "https://i.imgur.com/FrVumxY.png",
                                        "size": "Medium"
                                    }
                                ]
                            }, {
                                "type": "Column",
                                "width": "stretch",
                                "verticalContentAlignment": "Center",
                                "items": [{
                                        "type": "TextBlock",
                                        "size": "Medium",
                                        "weight": "Bolder",
                                        "text": "Component Missing [ADP-xxx]"
                                    }
                                ]
                            }
                        ]
                    }, {
                        "type": "TextBlock",
                        "text": "Initiator: ",
                        "wrap": true
                    }, {
                        "type": "TextBlock",
                        "text": "ADP-xxx: Fixing reset password validation",
                        "wrap": true,
                        "weight": "Bolder",
                        "color": "Accent",
                    }, {
                        "type": "TextBlock",
                        "text": "Status: QA Ready",
                        "wrap": true
                    }, {
                        "type": "TextBlock",
                        "text": "Type: Bug",
                        "wrap": true
                    }, {
                        "type": "TextBlock",
                        "text": "Assignee: ",
                        "wrap": true
                    }
                ],
                "actions": [{
                        "type": "Action.OpenUrl",
                        "title": "Open in Jira",
                        "url": "https://xxx.atlassian.net/browse/ADP-xxx"
                    }
                ],
                "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
                "version": "1.4"
            }
        }
    ]
}

I have tried posting various different combinations of summary attributes with no effect.

Is there a whole better way of doing this, or is there a few tweaks I can make?