Array of objects feature

I was looking for any way to create an array of jsons to send as body of a http post.
In the case where a device is running more than one sensor I think that would be the cleanest solution
body: [
{
id: 'mytemp',
value:50
},
{
id: 'myhum',
value:60
}
]

I tried to build this json using the actual api but is it not possible without a custom lambda

**Additional context**