Using the \tweak command to tweak individual grobs
With the \tweak command, every grob can be tuned directly. Here are some examples of available tweaks.
\version "2.24.0"
\relative c' {
\time 2/4
\set fingeringOrientations = #'(right)
<
\tweak font-size #3 c
\tweak color #red d-\tweak font-size #8 -4
\tweak style #'cross g
\tweak duration-log #2 a
>2
}