The Greek that is translated in English as “(my joy) might remain in you” or “(my joy) may be in you” is translated in Tzotzil as “these things I have told you in order that your hearts may be happy-untroubled like my heart is happy-untroubled.”

“If Jesus’ words in John 15:11 were to be translated literally (…) it would infer that Jesus had given all His joy away and so not have any Himself.” (Source: Marion Cowan in The Bible Translator 1963, p. 90)

See also we might become the righteousness of God.