Thank you for reaching out. Firstly, this article is written considering environment setup within the organization. Though your question is generic hence I would suggest to check the settings in the jenkins. It is a one of the feature in jenkins and secrets bypassing is not possible. Check this article as well if it can be of any help

https://stackoverflow.com/questions/53444154/how-to-set-secret-for-github-webhook-in-jenkins#:~:text=Configure%20Github%20plugin%3A%20Jekins%20%2D%3E,the%20credential%20created%20in%20Jenkins

For more details, you can join the jenkins channel on gitter and we would be happy to help. Thank you once again for reaching out. Take care. Have a wonderful day.