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function! GetLinkTarget(group)
    let l:groupID = hlID(a:group)
    " Get the group this highlight group links to
    let l:linkedGroupID = synIDtrans(l:groupID)
    let l:linkedGroupName = synIDattr(l:linkedGroupID, 'name')
    echom a:group . " → " . l:linkedGroupName
endfunction

Example usage:

:call GetLinkTarget("vim9Comment")

Output:

vim9Comment → Comment