Disclaimer: You can do this when the blue circle is and isn't around your character while the person helping you is doing the "Jump to me" Emote.

Joystick:
1) Have one person do the "Jump to me" Emote.
2) Begin moving towards the person doing the "Jump to me" Emote.
3) Press the jump button as you hold the movement stick towards the person doing the "Jump to me" Emote.

You will jump towards them!

For Keyboard, it's even easier.

1) Have one person do the "Jump to me" Emote.
2) Hold "W" towards the person doing the "Jump to me" Emote.
3) As the blue circle is around your character, press the jump button (Spacebar) while holding "W" towards the person doing the "Jump to me" Emote.

You will jump towards them! Even easier!

My friend and I tested this for about 20 minutes until we found a consistent answer.