We usually add out-of-the-box support for new platforms once they get enough traction. Currently we are still assessing the popularity of the new nRF Connect platform and will be deciding whether to support it directly in the next 4-6 months. As a workaround, please try creating a project manually as shown in this tutorial.
Alternatively, we can support nRF Connect earlier via our paid custom BSP program. Please feel free to contact our sales to get a quote for this.