How do I use the jumplist to jump once per file?

My EnhancedJumps plugin has mapping variants of <C-o> / <C-i> to restrict jumps to the current or to different buffers.

<Leader><CTRL-O>, <Leader><CTRL-I> Go to [count] older / newer cursor position in another buffer. Jumps inside the current buffer are not considered. Useful for recalling previously visited buffers without going through all local positions. Regardless of the jump direction, the last jump position in a buffer is used when there are multiple subsequent jumps in a buffer.