Zephyr Cloud REST API : How to Get custom field details by entity type and project via API?

How to Get custom field details by entity type and project via API Zephyr Cloud?

In JIRA service use URL to Get custom field details by entity type and project : GET https://jira.easy2easiest.com//rest/zapi/latest/customfield/entity?entityType=EXECUTION&projectId= 

Zephyr Technical Documentation : https://zephyrdocs.atlassian.net/wiki/spaces/ZFJ0500/pages/1906737185/Custom+Fields+API#Get-custom-field-details-by-entity-type-and-project