Missing FFMpeg support for 32bit float AVS Input

[FranceBB]

Hi there guys,
it looks like FFMpeg supports Avisynth input with 8bit, 10bit, 12bit, 14bit and 16bit planar, but doesn't accept 32bit float as input.
Using a simple:

ColorBars(848, 480, pixel_type="YV12")
ConvertBits(32)

ends up with:

[avisynth @ 0572ca80] unknown AviSynth colorspace -1610481656
AVS Script.avs: Unknown error occurred

Aside from this incomplete Patch from 2017 (https://patchwork.ffmpeg.org/project/ffmpeg/patch/20170720154659.29102-1-vittorio.giovara@gmail.com/#14125) I haven't found anything about FFMpeg supporting 32bit float. Do you know if there has been any progress since 2017 to support 32bit float input from Avisynth in FFMpeg?

[tormento]

it looks like FFMpeg supports Avisynth input with 8bit, 10bit, 12bit, 14bit and 16bit planar, but doesn't accept 32bit float as input.
Any hint here (https://ffmpeg.org/doxygen/trunk/avisynth_8c_source.html)? It seems it supports RGB only.