No, we do not have official patches for meson v0.47 compatibility.

However, there is a WIP (will be revived if I become available for hobby projects) patch for 0.49 and this might be helpful for your need. I'm not sure if it's compatible with 0.47, but set 0.49 because 0.49 was available in the given environment for this instance.

https://github.com/myungjoo/nnstreamer/commit/c5136e3fc5e83c7a8c8127ed74969738e2f56cca#diff-30d8f6be6320feeacf686be94f48c70869b52630e01ea625f0f15adc0d57c3e4

This branch might be removed or updated soon. So if you need it, please fetch it.