Thank you @santimir ,
The document looks like Pavel suggested
{
"pity":[
{ "type":"weapon", "totalWishes":0 },
{ "type":"character", "totalWishes":0 },
{ "type":"standard", "totalWishes":0 }
]
}
However, I’ve tried what Pavel suggested before I made this post, and not even that worked. The expected output is actually to increment totalWishes, but I thought there was an issue with using the $inc operator so I tried using $set to no avail.