how to use ffmpeg to set inband-fec when encoding opus with libopus

I'm learning ffmpeg to encode opus using libopus, I can set inband-fec in libopus like opus_encoder_ctl(aEncoder_, OPUS_SET_INBAND_FEC(1)), but when I use ffmpeg I cannot do that, I tried opt = av_opt_find(m_codec_ctx, "inband_fec", NULL, 0, 0); and ret = av_opt_set_int(m_codec_ctx, "inband_fec",1, AV_OPT_SEARCH_CHILDREN); but got option not found, so is there any way to set inband-fec in ffmepg when using libopus?