how to use field in MyVideosxxx.db

my purpose is to show the list of all the date where i saw a movie
I have 3 options (at least)
    1) create a database with a table with movie/date_seen
    2) create a filed in a existing table (say files)
    3) use a field not use in movie table (say c04) or in view movie_view and  concatenate all the date for a movie (something like c04[movie]= yy1/mm1/dd1;yy2/mm2/dd2;... )

https://kodi.wiki/view/Databases/MyVideos#movie

for the moment, this database or field are fill with a sql script outside kodi.

it seen to me that the simpliest job is 3)
my question here is how to see the result in a skin (say estuary)

I have seen that i can see (for example) LastPlayed date  in "dialogvideoinfo.xml
<param name="label" value="Derniere vue: $INFO[ListItem.LastPlayed]" />

i would like to know how  to "listitem" c04 ?   something like $INFO[ListItem.c04] !!
or use the external table ?