Welcome to the community.
What do you mean by custom page? Could you please clarify?
Page like where I can create my own fields and could design it according to my requirement. I have attached the snapshot below for the reference.
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If it is a team-managed project, Customize an issue's fields in team-managed projects.
If company-managed project, you have to create custom fields and then add them to relevant screens. Configure issue custom fields Before you do that I recommend taking a look at this admin guide: Administer Jira Cloud products
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