We do something similar. We use OpenCPN for route planning on the MacBook, which is integrated to the boat network through a wireless connection so it can get GPS position, wind, depth, etc. (essentially whatever is available on the NMEA network).
You can then export it and there are ways to import into our Raymarine chartplotter though we don't do the import part. Once we agree on a route, that normally is enough to guide us using the chartplotter.
Whichever path you go, recommend keeping OpenCPN on the MacBook as a backup option, not necessarily the best standalone solution IMO but great for backup, route planning, etc.
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