[R-meta] Standardized response mean

Hi everyone,
Hope you are well. I have a query re: meta-analysis of responsiveness
measures.

My effect size is a standardized response mean and I am wondering how can I
compute its variance or standard error.
 Also, should I use the same code in metafor for standardized response mean
as we do for Cohen?s d?

Please let me know.
Thank you,
Hazel