Concatenate a word to an email using pre-defined grok filter

Elastic Stack Logstash
1

hi,
first of all thank you for reading my question.
i have an email address in a log in following format,

Apr 24 19:38:51 ip-10-0-1-204 sendmail[9489]: w3OJco1s009487: sendid:name@test.co.uk, delay=00:00:01, xdelay=00:00:01, mailer=smtp, pri=120318, relay=webmx.bglen.net. [10.0.3.231], dsn=2.0.0, stat=Sent (Ok: queued as E2DEF60724), w3OJco1s009487: to=<username@domain.us>, delay=00:00:01, xdelay=00:00:01, mailer=smtp, pri=120318, relay=webmx.[redacted].net. [10.0.3.231], dsn=2.0.0, stat=Sent (Ok: queued as E2DEF60724)

and i need to extract the email along with the word sendid

output should look like this,

{
  "DATA": [
    [
      "sendid:name@test.co.uk"
    ]
  ]
}

i have tried following but it only extracts email i tested it here, http://grokdebug.herokuapp.com/ ,

sendid:%{DATA},

How can i concatenate the word sendid: to the email without creating a new field or defining a new regex? can someone please help?

i have also tried this but it doesn't work,

sendid:%{"sendid:"} %{DATA},

2

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