For targeted metabolomics data, can non-targeted enrichment analysis methods be used?

Hello, I have a question about metabolite set enrichment and pathway enrichment analysis. I have a batch of targeted metabolomics data, including amino acids, acyl-carnitines, and a lot of lipid species. But the structure of the lipid was not fully characterized, only the number of carbon atoms and double bonds in the acyl chains are known. Therefore, when I put the lipids’ names into the “Metabolite set enrichment analysis module” of Metaboanalyst, some lipids cannot be identified. In this case, can I use the “Functional analysis” module to map potential metabolite sets? Can I input amino acids, acyl-carnitines and other metabolites together with lipids when doing enrichment analysis?

Thank you very much for your help. Best wishes to you!