Due to the significant expansion of offshore grid connections expected in Germany in the coming years, a substantial contribution to grid stability is required from DC-connected Wind Power Plants (WPPs). In this context, grid-forming (GFM) capabilities are mandated by the grid codes, which also address inertia provision among other features. While the wind industry is making relevant progress in developing products capable of providing GFM capabilities, proper coordination with the High-Voltage Direct Current (HVDC) system is essential to efficiently transmit the inertia contribution of the WPP to the onshore network. In this scenario, two German TSOs, TenneT and Amprion, along with the HVDC division of Siemens Energy (SE), have conducted feasibility studies in 2025 to further investigate the potentials and limitations of such systems in providing inertia contribution at the onshore connection point of an HVDC offshore WPP connection. This paper presents the main outcomes of this collaboration, demonstrating that by implementing a GFM control at both converter stations of the HVDC system, it is possible to efficiently transmit the contribution of the WPP to the instantaneous reserve provision at the onshore connection point, without the need for signal telecommunication.