This article shows how to synchronize the remote issue link to a custom field on destination instance.
Destination side
- Add a URL custom field. Let's name it "References".
Note: Check out Atlassian documentation for more information about custom fields: Adding a custom field
- Add the code below into the Incoming sync
1 // We can concatenate the string with the key and the Jira Url(X), remember to update accordingly
2 issue.customFields."References".value = "https://X.atlassian.net/browse/"+replica.key
Note: "References" is the name of the custom field, you've created in the first step. You can change it to any custom name.