How use QP mode

[4uma]

In official docs for HEVC plugin I find parameter bit_rate_mode.
It has modes like:
Constant quantization (CQT) 
Average quantization (AQP)

But I can`t find any parameters how i can set expected QP?
(I need same QP for I-P-B frames, for high quality)

P.S.: Same question for Constant rate factor (CRF).