The Sendinblue integration module for Contact Form 7 is under development. We plan to include this module into Contact Form 7 5.4, which will be released next February.
Are you interested in being one of the initial stage users of the module? We call for volunteer beta testers to try this module on their websites and report issues if they find bugs or room for improvement.
If it is OK for you to become a beta tester, please refer to the instructions on the GitHub repository page and download a plugin package for the module.