Currently, Jira Align has a limitation on the number of custom fields that can be created and used in a Portfolio, being it:

• Custom Text Input – Up to 2 fields
  • A small text entry box, intended for words or short phrases.
• Custom Dropdown – Up to 3 fields
  • A drop-down list of choices, where one selection can be made.
• Custom Text Area – 1 field allowed
  • A larger text entry box with some Rich-Text Formatting abilities, intended for paragraphs.
• Custom Multi Dropdown – Up to 2 fields
  • A drop-down list of choices, where one or more selections can be made.

However, due to this limit, it can impose challenges when using JA as a source of truth and causing problems when syncing data between JA and Jira, so having the possibility to create more fields would help with this.