From version 0.12.0 of ckbplotr, the marquee package is used for forest_plot() row labels. There is no built-in way to indent rows labels, but you can add spacing characters. For example, use glue::glue() to add multiple “em quad” characters (“\u2001”) to the row labels:
10.2 Using ggtext (Version 0.12.0 or earlier of ckbplotr)
If using an earlier version of ckbplotr (or have set row.labels.element = "ggtext::element_markdown"), then you can add the following to labels for transparent text.