Traffic-lights for Jira Cloud already contains a tab „import“ supporting the migration of related data from Jira Server or Jira Data Center into Jira Cloud:
Ensure that you have successfully installed ver 4.0.8 or later on-premise
Export your data into an XML file according to the short documentation on the screencopy below:
Import your data into Traffic-Lights for Jira Cloud by selecting this XML file from your local file system and click on “import”.
On-prem field types
The importer is capable to import my “Traffic-Lights for Jira” (Server/Data Center) as well as the data of “Simple Traffic Lights for Jira” by t2consult, not offering a Cloud solution currently.