Legal drafting is a complex activity that involves different actors and end-users, usually belonging to the administration staff. AI tools could support this activity by providing useful aid for various tasks. This paper presents two scenarios where the AI add-on supports the legal drafting activity conducted using the LEOS web editor, developed by the EU Commission for EU legislation. The two scenarios are the following: i) retrieving the relevant existing normative definitions connected with the ongoing bill, by using algorithms based on semantic similarity; ii) suggesting the normative more pertinent references when some information is missing (e.g., the year); iii) aiding the drafter in following templates for improving clearness and regularity in the norms (e.g., modifications). Additionally, it is crucial to model a user interface that is capable of guaranteeing some foundational principles: accessibility, transparency, usability, user experience, and explicability. This paper presents the output of this project conducted in collaboration with the DG Informatics of the EU Commission.