No, in fact we have no way to decrypt the emails on our servers, nor can we share them in an unencrypted format with any third parties (law enforcement included). All the data requests we comply with only include metadata which needs to remain unencrypted for the services to function properly.
Under Swiss law, Proton cannot be compelled to do this. Nor is this "easy" to execute if you are using the open source mobile or desktop apps.