I was trying to create a filter using the API, however I didn’t find the structure in the documentation for the case of a related field. After some tests, I arrived at this structure and it worked (the values ​​are just illustrative):
"field_id": 250782,
"field_type": "multi_relation",
'match_type': "contains",
"values":
[
{
"value":
{
"record_id": 1121111,
"app_id": 12345,
"title": "teste"
}
}
],
"type": "app"
}
```