How to Reuse the Subject Line from the last sent email in a campaign

I have created a Mautic campaign but this time I want to give my audience a personalized feel.
Hence I want my email’s Subject Line to be seen as “RE: Regarding…”

Now the Subject line will keep varying based on my first email.

I have tried “Re: {subject}” but it didn’t work, it send the email with exact same text. Where as I wanted the previous email subject line.

Has anyone tried something similar to this or knows a work around for it ?

You can create different email templates based on how much variety of emails you want to send, then you can set the condition if customer read the mail , then send that different mail which you want to send.