Hey !
You need to use what is referred as "sidechain sources" for that.
For example, if you used LFO 1 to modulate the pitch, and plan to use LFO 2 to control the amount of modulation :
-Click on LFO 1
-Below the destination, click on "Sidechain"
-Choose the desired modulation source
-Set the sidechain modulation amount. A value of 1.00 makes the sidechain source modulate the complete modulation (meaning no modulation occurs if the sidechain source is at 0)
Hope it helps !
Best