Does Remarkable support Adobe DRM? If not, then the vast majority of places you can get ePubs either (a) won't be compatible, or (b) won't have the ebooks you care about (because publishers only sell them with DRM).
So no, unless you're going out of your way to use a workflow that's unsupported and of questionable legality (DRM stripping), you probably can't read ebooks you care about on this device.
So no, unless you're going out of your way to use a workflow that's unsupported and of questionable legality (DRM stripping), you probably can't read ebooks you care about on this device.