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As per my understanding, GFPS profile requires either the Advanced Audio Distribution Profile (A2DP) or the Hands-Free Profile (HFP). In that case its irrelevant to implement in CYW20719 as this chip won't support Audio profiles.
CYW20721 supports Audio and GFP feature is added as mentioned in release notes here: BT SDK 1.4 Release Notes
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The 20721B2 is a specialized audio device, so it's not supported in the broad market and here on the community.
You will want to reach out to your local Cypress sales/distribution team to discuss engagement.