Passing Javascript references to AssemblyScript

Question

Is it possible to pass a Javascript ref type to assemblyScript solely for the purposes of being retrieved again later? To be clear, I do not want to access the JS object from the WASM side in any way. So no typing should be necessary, I literally want to ‘associate’ a WASM class instance with a corresponding JS instance, such that the JS side can set and retrieve its own ref in the WASM class;

AssemblyScript would look something like;

export function setRef(node: Node, jsRef: i32): void {
    node.jsRef = jsRef;
}

export function getRef(node: Node): i32 {
    return node.jsRef;
}

I cannot find any info that describes this or a similar scenario. Without this I am having to maintain a mapping on the JS side with all the huge performance implications that implies.

Using i32 my references get passed as zero and if I use externref instead the compiler crashes