metaprop forestplot bold font in subgroup headings

[Sapphire AT]

Hi I use metaprop to perform a meta-analysis on my outcome (proportion) - stratified by a variable. I would like to make the subgroup headings bold as I could do for "admetan" and "forestplot, useopts". But this didn't work for "metaprop". Is there any way to make the subgroup headings bold in "metaprop"'s forestplot?