1. There are standard HCI commands related to OOB pairing, please check BT core spec for more details. However, we have not tested OOB functionality at our end. Also, we do not have a specific code example for reference, please check BTM_PAIRING_IO_CAPABILITIES_BLE_REQUEST_EVT in demo.hello_client example in WICED SDK.
2. You can use Vendor Specific command for this. You will need to connect your device to peer device using HCI command and then use set tx power vendor specific command for setting the tx power. Please refer- CYBT-423028-02 BT module (CYW20719 radio): How can transmit power be controlled?
Please refer Configuring Transmit (Tx) Power on CYW20706 Chip - KBA228573 for more details about CYW20706 tx power.
What update do you need on this? I have already addressed your query.