Error while parsing additional fields. Not valid JSON. when adding a simple code comment line

Question

Everytime I try to add a code comment with // or */ .....*/ I got:

Error while parsing additional fields. Not valid JSON.

Anyone knows how to add comments here?

In automation I'm edditing issue fields in advanced mode to add approvers automatically.

Since this must be done with accounID I would like to add a comment with the name of the user to be easier.

{
"update": {
"customfield_10000": [

// AccountID: 123192839018904 -- Username: Diogo

{
"add": { "accountId": "123192839018904"}
}
]
}
}

Fazila Ashraf · Answer

The json is not a code but input to the end point.

You could also log the details to the audit log using https://support.atlassian.com/cloud-automation/docs/jira-automation-actions/#Log-action

Alex Koxaras -Relational- · Answer

You can't comment on your code. You can log it in your automation using the "Log" component, but nothing else.

Diogo Rodrigues · Answer

is quite odd I cannot comment my code. 
Is not a pretty solution but definetly an option if nothing else exists.