There isn't any real difference between metering near and far scenes.
The M6 manual explains that the metering zone is 2/3 of the short side of the relevant framelines for a given lens. So obviously, the farther away the subject, the more subject area and tonal variations you will usually have in that space. Including more sky or snow, for example, will skew the reading.
But, near or far, the principle remains the same; the meter treats that zone as 18% gray. So you need adjust for what's read in the metered zone.
In either case, you can always take a reading from something close to middle gray with similar lighting and be confident using that setting. In fact, I think one of the best things we can do is learn to recognize middle gray and how what we see varies from that tone.
John