Hi.
JJazzlab 5.1 is a free and open-source software, that can use Yamaha styles as the accomp part.
Lots of assets for the software is to find at the website, as well as tousands of Yamaha styles if search the web.
Those who are a bit familiar to the BiaB concept will recognize the workflow.

https://www.jjazzlab.org/en/
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Cheers 🥂
GJ
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"Success is not counted by how high you have climbed
but by how many you brought with you." (Wil Rose)