Token based authentication for FortiManager and FortiAnalyzer is available since v7.2.2:
https://how-to-fortimanager-api.readthedocs.io/en/latest/001_fmg_json_api_introduction.html#token-based-authentication

fotoobo should support this new authntication method.
It should be added as a new method. The legacy way of login with username / password should still work.