How to indicate a note is in absolute pitch/position while the rest of the notes are in relative mode?

[Xiaoyu Ding]

In relative mode, is there a simple way to indicate one note is in absolute 
mode, not relative to the note before it, and not impact the next note's 
position.

For example:
        \relative c {
            ...
            ...
            <g  (some tweak here) c' f>
            ...
            ...
        }
        
c' is middle c, regardless the position for g and will not affact f's relative 
position.

Thanks!

Xiaoyu