Hi Jacques,
To import data from Bamboo you can check out our documentation about how to import from REST API. How I can see in the Bamboo documentation there are API endpoints available for plans and builds https://developer.atlassian.com/bamboodev/rest-apis/bamboo-rest-resources
For authentication probably use basic HTTP authentification described there https://developer.atlassian.com/bamboodev/rest-apis/using-the-bamboo-rest-apis#UsingtheBambooRESTAPIs-authenticateRESTAuthentication
Regards,
Gatis.