You might try Exiftool.
https://sno.phy.queensu.ca/~phil/exiftool/This is outside DigiKam, and there is a learning curve, but it is great fun
to play with the program.
Here are a few examples of commands.
<File path> is the path to the file, e.g. C:\photos\blabba.tif
<Folder path> is the path to a folder, e.g. C:\photos\
List all info in a file
exiftool -a -u -g1 -extractEmbedded -api RequestAll=3 <File path>
List info for keywords
exiftool -a -u -g1 -extractEmbedded -api RequestAll=3 -Keywords <File path>
Display directory name, file name, and keywords into out.txt, formatted
exiftool -a -unknown -ee -api RequestAll=3 -ignoreMinorErrors -ext tif -p
"$directory $filename $Keywords" <Folder path> > out.txt
Display directory, filename, "++", and keywords in out.txt if there are
keywords
exiftool -a -unknown -api RequestAll=3 -ignoreMinorErrors -ext tif -if
"$Keywords ne ''" -p "$directory $filename ++ $Keywords" <File path>
--
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