objects_make_LUT

lookup_json = ds_map_create();

obj_start = <obj_block_first>
obj_end = <obj_block_last>
i = obj_start

while (i <= obj_end) {
    var replace = string(i) + ".000000"
    var replace_with = object_get_name(i)
    lookup_json[? replace] = replace_with

    i++
}

console.log(json_encode(lookup_json))
ds_map_destroy(lookup_json)