Increase the transmit power on watch so that the range is more than 150 feet

Verification

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use ble_phy_txpwr_set(tx_pwr_lvl)

Description

Hi all,
I try to connect the Watch to the Nrf Tools App more than 150 feet (currently only about 15 feet in a house). I read some document and thread about Nimble, I add this code:
/* Set tx power level. */
rc = ble_phy_txpwr_set(tx_pwr_lvl); // tx_pwr_lvl == 4
memset(&fields, 0, sizeof(fields));
fields.tx_pwr_lvl = (uint8_t) tx_pwr_lvl;
in function StartAdvertising() of NimbleController.cpp.
The above doesn't seem to have an effect on the contents of the advertising packet; it still advertises around 15 feet.
The comment in https://github.com/apache/mynewt-nimble/blob/089f0d849a49a2a6c69f1e1f9103174b81af8b1a/nimble/drivers/native/src/ble_phy.c implies that this should be handled automatically, and the provided value is ignored. Is this implemented as described, or am I doing something wrong?
The actual tx power does change, I see the expected difference in received signal between +4, 0, -12, -20.
Thanks all

Start in NimbleController.cpp at StartAdvertising and inspect how ble_phy_txpwr_set(tx_pwr_lvl) and the advertising fields are used. Compare that behavior with the referenced NimBLE ble_phy.c comment and determine whether the requested setting is expected to affect advertising range. Done means a confirmed explanation or a focused change that makes the intended transmit-power behavior work.