Thank you for reaching out.
Per your description, I understand that you would like to change the name of the field "Raise this request on behalf of" to a different text when creating the ticket as an agent. Is that correct?
Unfortunately, Jira does not have an easy way to change that text as a field, however, we have the following feature request to change it:
Feel free to vote and watch the suggestion to increase its priority and also receive notifications about any updates.
As a possible workaround, you can manually edit a custom language pack and upload it to your Jira, however, you would need so coding ability to modify the strings to add the text you want:
Let us know if you have any questions.
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