Add custom fields existing on Xray Data Center to Xray Cloud

On Xray Data Center there are several valuable custom fields added to Jira when Xray is installed. These fields should be implemented also on Xray Cloud. Custom fields:

Test Plans associated with a Test

Tests associate with a Pre-Condition

Tests associated with a Test Plan 

Tests association with a Test Set

Tests association with a Test Execution

Test Sets association with a Test

Pre-Condition association with a Test