Functional / pathway / network analysis for continuous / quantitative phenotype?

Hi there - I have performed functional network/pathway analysis in Metaboanalyst for a case/control study … but I also have som continuous phenotypes (e.g., lean mass) that I would like to perform it for. For the former, I input the tscore, m/z, p-value, etc. Is there a way to perform a similar (mummichog/GSEA) for a quantitative trait like lean mass in Metboanalyst? Could the t-score be replaced with an effect size (standardized?) or something? Or is there some type of ranking approach that could be used in Metboanalyst? I am so sorry - I am probably missing this somewhere. Thanks for any help.