How to use map_type with the import_types macro?

Both of these produce an error "invalid type: string "::indexmap::IndexMap", expected a borrowed string"
```rust
typify::import_types!(schema = "schema.json", map_type = "::indexmap::IndexMap");
```
```rust
typify::import_types!(schema = "schema.json", map_type = ::indexmap::IndexMap);
```
Is there a way to override map type while using the macro?