All nRF5x chips have single radio HW block so I'm wondering how you envision full antenna diversity scheme. However if you mean switching the antennas based on various events like Tx/Rx slot then yes, you can use PA/LNA events which will generate GPIO pulses and you can control some RF switching element by that easily. This is part of S132 stack from the very beginning (first certified production version 2.0.x) and the same for S112 and S140 (which are derived from S132).
