When some of the animations are exported, there will be，x,y,width,height，For example：
{"skeleton":{"hash":"6ecC3ihAPgx0t+k8HLNrhOilLno","spine":"3.8.81","x":-794.83,"y":-187.38,"width":1623.21,"height":660.71,"fps":60,"images":"./images/","audio":""}
But some don't：
{"skeleton":{"hash":"EguD9dyHd7OSeRvorfmLeODrQkk","spine":"3.8.81","fps":60,"images":"./inages/","audio":""}
What do I need to set up in the editor to have these fields
（导出骨骼动画的时候，有的有x,y,width,height这几个字段，有的没有，和什么因素有关呢，我需要在编辑器里面怎么设置才能够输出这几个字段呢）
