This paper uses Mixed Reality (MR) technologies to provide a seamless integration of digital information in physical environments through human-made annotations. Creating digital annotations of physical objects evokes many challenges for performing (simple) tasks such as adding digital notes and connecting them to real-world objects. For that, we have developed an MR system using the Microsoft HoloLens2 to create semantic representations of contextually-aware real-world objects while interacting with holographic virtual objects. User interaction is enhanced with use of fingers as placeholders for menu items. We demonstrate our approach through two real-world scenarios. We also discuss the challenges for using MR technologies.