Where proxy password is stored in IDEs on WIndows 10?

I'm using several Jetbrains IDEs (IntelliJ/PyCharm/Clion) behind corporate firewall. I setup proxy with a configuration URL and it works but it asks me for proxy user/password every time after I quit and restart the IDE. I also have the option to save password in KeePass but if I open the database file with KeePass.exe and a master password it's empty.

Is there any options to store the password somewhere so that I can automate the process to update it whenever my password is changed and without having to re-enter it?

I already tried using a script to automatically update IntelliJ's vmoptions file with a list of Java Proxy options (i.e. -Dhttps.proxyHost...) but from the log, IntelliJ doesn't like that