Is there a standard way to represent keyword synonyms in the metadata

[vbnut]

I'm not sure if other applications have something like this, but Adobe Lightroom (Classic) allow folks to define one (or more?) synonyms for a keyword.  When exporting images, Lightroom includes those synonyms in the ITPC:Keywords tag, but since it sorts the elements in that tag alphabetically, there is no way to determine which entries are synonyms and which synonyms are associated with which keyword.

I've searched both the exiftool site and the internet, and haven't found any info about metadata tags to represent keyword synonyms and/or associate synonyms with keywords.  Is there any "standard" way to represent that information in the metadata?

[Phil Harvey]

The only way I can think of associating keywords is by using HierarchicalKeywords, but the concept behind this is not intended to be used for synonyms.

- Phil