Custom domain with self-signed certificate

Hello everyone! I was wondering if it's possible to host an app on the mendix cloud with a self-signed certificate through LetsEncrypt instead of having to work with a CA? I intend to use this cert to host a custom throw-away domain for testing before determining if we should actually invest in getting a real domain name + CA signed cert. TIA!
1 answers

And try it!  Self-signed certificate should be OK but some error message may appear on the browser.