Don't worry, 6969 is an option
It actually isn't for this specific jewel.
This thread was added on June 10, 2019, with posts from Mark_GGG.
Original Post
https://media.discordapp.net/attachments/153610927143518208/587224433593286667/PathOfExile_x64Steam_2019-06-09_06-19-40.png
42069? 69420?
Second one works.
Wait. Would this work for charge types players can't normally get? (well, without Headhunter) It doesn't specify only endurance/frenzy/power charges.
It does work with any kind of charge, but you need to have able to have that kind of charge (i.e. have a non-zero maximum value for that charge type).