Create pre push hook with atlassian-connect

Bitbucket Development Bitbucket Cloud
,
1

Hi all,
I’m sorry in advance if my terminology is not correct.
I’m developing my first atlassian-connect app and trying to create a pre-push WebHooks.
currently I only get post-push events repo:push

this is my atlasian-connect.json file:

{
    "key": "<app-key>",
    "name": "my app",
    "description": "desciption",
    "vendor": {
        "name": "EDITME",
        "url": "https://www.atlassian.com/EDITME"
    },
    "baseUrl": "https://cc578aa8.ngrok.io",
    "authentication": {
        "type": "jwt"
    },
    "lifecycle": {
        "installed": "/installed",
        "uninstalled": "/uninstalled"
    },
    "modules": {
        "webhooks": [
            {
                "event": "*",
                "url": "/webhook"
            }
        ],
        "repoPages": [
            {
                "url": "/connect-example?repo_uuid={repo_uuid}",
                "name": {
                    "value": "<value>"
                },
                "location": "org.bitbucket.repository.navigation",
                "key": "<key>",
                "params": {
                    "auiIcon": "aui-iconfont-pages"
                }
            }
        ]
    },
    "scopes": ["account", "repository"],
    "contexts": ["account"]
}

and I have a app.post('/webhook') in my app.js file that listens to the those events.

how will be best to implement this, also I want to be able to block the push depending on the success / failure of my functionality…

I understand that this may seem like a plugin… is there a way to create a plugin like this in atlassian-connect?

Thanks!