Some other suggestions for you to consider:
1) (this is addressing specifically when using smart values for issues while using Automation for Jira) - https://support.atlassian.com/cloud-automation/docs/find-the-smart-value-for-a-field/
2) Use this similar URL, where you can simply replace the ID value to find the field name manually - https://<yoursite>.atlassian.net/secure/admin/EditCustomField!default.jspa?id=xxxxx
Best, Joseph Chung Yin
Jira/JSM Functional Lead, Global Infrastructure Applications Team
Viasat Inc.
The easiest way to identify those fields would probably be to use the REST API to get the context for each one. Your other option is to go into Project settings > Request types and look at the request form to identify all custom fields that you have added.
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