Sometimes it is possible to use samples from a HALion vstsound file in Groove Agent (if the layer is unlocked), but the presets are not compatible. I’m pretty sure the samples in the drum kits that come with Steinberg Hosts for HSSE are locked.
The good news is that a decent brush kit does exist for GA. Somehow it got buried over the years deep in Media Bay (but doesn’t show up in GA’s own internal browser). See this thread…
The screen shots show full GA5, but the brush kits should work in SE as well.