Blender gltf export - set custom properies type - box (Help create box collider plsssss)

[Vadim66]

Hello everyone, I am beginner in this and cant to configure box colliders in blender for export gltf2.0 (GLB). How i can do this? In instructions says ( • Box colliders.
To add these add a cube, move, rotate and scale the cube in object mode. Do not add a material to the collision object. Do not move the vertex of the cube in edit mode. Set custom properties to type = box. Don’t use type=obstacle unless you have express authorization from the engineers.)
I try in Physic properties collision on, riggid body type passive, custom properties - default float, but i changed it on strip, float array etc.
i can't figure out how to do it

[Vadim66]

were is this custom properties

[Vadim66]

I have only these properties