Yes we can do this in LMMS, except the groove-pattern file drag-in.
As of present LMMS has nothing like that, but it is also 'only' a way to make the process less work-intensive.
I have seen other artist making percussion grooves 'on-the-fly', eg they listen to their composition and manually do groove-hits, they then capture, as the music play in the DAW. Again that is also possible in LMMS, as seen in this video
LMMS can do a lot! : P
Also dk if you remember my vid on swing
Again also fully possible in LMMS