@Sir-Prize SSB calculates both of these ratios in:
The kills-to-loses ratio is not displayed in the UI because I did not want to display to many of stats. However, you should be able to show it by modifying just this line of code:
FROM:
Columns.Score.Keys = { 'score', 'ratio.killsToLoses'} --, 'ratio.killsToBuilt'}
TO:
Columns.Score.Keys = { 'score', 'ratio.killsToLoses', 'ratio.killsToBuilt'}