Announcing the general availability of Power Apps modern commanding

Microsoft announced modern commanding with Power Fx is now generally available (GA). Modern commanding provides a maker friendly low-code/no-code experience for customizing model-driven app command bars – with the first ever in-product command designer and the ability to use Power Fx (or JavaScript) for expressing business logic.

Please refer below article for more information –

https://powerapps.microsoft.com/en-us/blog/announcing-the-general-availability-of-power-apps-modern-commanding/