texture nom supporter bedrock

hello i have a problem i am on bedrock when i want to create an item, food, block i but a texture "image.png" and on the right it gives me but texture not support and in the small description it tells me that it is necessary an obj or json file but for an item I don't see the point since it's 2D, well, so my question is is it a bug or which file should I use? and how to create them thank you in advance. sorry for the translation i did it with google trad