We would like to change BLE's PHY setting 2Mbps to 1Mbps

We would like to change BLE's PHY setting 2Mbps to 1Mbps in Audio profile. 
In SDK ver2.3.0, we could find BLE's PHY setting as follows;

Let me confirm the point to be modified in your SDK.
I have found the following description and it might work as we want, if we could change the argument of this structure.

-le_audio_cis_headset.c
127line
static const struct bt_codec_qos_pref qos_pref =
  BT_CODEC_QOS_PREF(true, BT_GAP_LE_PHY_2M, BLE_ISO_RETRANSMITS, BLE_ISO_LATENCY_MS,

Would it be possible to let us know how could I modify?

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