Campaign webhooks are using application/x-www-form.urlencoded instead of application/json

My Mautic version is: 2.15.2
My PHP version is: 7.1.30

My problem is:

All the apps I want to trigger with campaign webhooks (Trello, Slack, etc.) require application/json format, but Mautic’s campaign webhooks are coming out as application/x-www-form.urlencoded.

The only way I have found to make it work is putting Zapier in the middle, but it requieres a premium account, and it will be awesome to connect Mautic directly to those apps.

I don’t know if there is a reason tu use application/x-www-form.urlencoded, but if there is, it would be great to be able to choose wich format I want to use.