Hi @Vipin Kumar
Thank you for reaching out to the community.
I'm afraid it is not possible to customize a dialog pop-up in Bitbucket Cloud at the moment.
However, I can request a feature request for this for you.
To do that, may I kindly ask the reason why you need to customize a dialog pop-up while merging a pull request?
Looking forward to your response.
Regards,
Mark C
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