Unless I'm wrong, when selecting edges to chamfer in F360 CAM space it doesn't really like selecting profiles of already chamfered edges in a model without a little tweaking of heights and offsets which my brain struggles with.
If should be possible to select chamfered faces, just like you select hole walls when defining geometry to drill.
Then the Chamfer width, offset and clearance could (in theory) be calculated from tool definition and model features.