Can I replace the equal sign with other custom sign

[youlu2017]

Operating system: macos 10.14.6

Jenkins Version: 2.176.2

Plugin Version:1.026

Mail Server: outlook365

I encountered a problem in the process of using it, can you give me some help?
Because the template of my email content can't be modified, I want get custom job parameters.
Can I replace the equal sign with the colon sign?
What should I do if I can?

Custom Job Parameters
https://github.com/jenkinsci/poll-mailbox-trigger-plugin#custom-job-parameters