Only with corrective optics
Fujifilm G sits 7.45mm further from the sensor than Micro Four Thirds. An adapter can only add distance, never remove it, so infinity focus is impossible without corrective glass in the adapter — which costs sharpness and usually a stop of light.
Coverage & framing. Micro Four Thirds lenses are built for a Micro Four Thirds imaging circle, which is smaller than Medium format. Expect heavy vignetting or a forced crop on a Fujifilm G body.