Multi level defaults write value as integer instead of string

From https://apple.stackexchange.com/questions/423115/macos-defaults-write-data/441755 I'm looking to add as above. Basically, trying to achieve https://support.google.com/chrome/a/answer/7591084#updatepolicysettings&zippy=%2Cturn-off-updates%2Csample-property-list I managed to add it like defaults write /Users/samson/Library/Preferences/com.google.Keystone.Agent.plist '{"updatePolicies" = {global = {UpdateDefault = 4;};};}' But the value 4 adds it as a string instead of integer like below. updatePolicies global UpdateDefault 3 How do I add it as an integer instead ? Also, this erases the existing plist contents and adds only what I added in above command? How do I add the above, in addition to what is already in the plist ? Thanks for the help in advance!