[Baertram]

SV is a global table with the name you specify at the txt file per ## SavedVariables: <globalName>

So your can read your sv file on the disk and you see the contents like
<globalName> = {
["@AccountName"] = {
["Charactername here"] = { ....


Just update it like this then:
<globalName>["@AccountName"]["Charactername here"]["variableName"] = xyz