The Location Service ETSI standard has evolved to closing a critical gap between the standards for positioning mechanism of 5G mobile networks and the Multi-access Edge Computing (MEC) standard framework. Location Service (LS) generally allows, among other functions, to optimize services according to users' geographical location. Although LS already offers features typical of the next generation of mobile networks, such as 3D positioning of user equipment, the LS standardization framework is still evolving to meet the demands in support of next-generation mobile networks, most notably the sixth generation paradigm. Some of the features in the current standards, for instance, the concepts of zones, carry the promise of possibly transformative LS applications in future mobile networks. For instance, LS can help the building of a "6G network of (sub-)networks", with various technology solutions, towards the fully decentralized network operation. These and the related developments are driving further evolution of MEC and LS standards to support such new features. This article addresses the evolution of current Location API standards towards 6G mobile networks. We propose extensions and improvements to the current Location API data model to include data fields to characterize novel features and the envisioned novel use cases in the next-generation mobile networks. We show that the proposed modifications allow us to abstract the user's location into a tuple of physical and network locations, allowing MEC applications to perform complex data flow optimization.