Add custom value to analytics when I send mails via the sendMail API

[newbie_mailer]

So I want to know if there is a way I can attach a custom field that will be added to the details of a mail delivery via the webhooks.
Now I understand you can add custom headers to a sending node or directly to mumaraOne but these details don't appear anywhere, so how do I know which particular main or campaign I'm getting its webhook, either via MumaraOne or the Mumara campaigns

 

[rehan]

Surely, it can, but let me reproduce the case on one of our test installations. I'll get back to you on this shortly.

 

[newbie_mailer]

Alright, please, I await your feedback on this, most especially on mumaraOne