How to cancel a wasm process from within a webworker

I have a wasm process (compiled from c++) that processes data inside a web application. Let's say the necessary code looks like this:

std::vector<JSONObject> data
for (size_t i = 0; i < data.size(); i++)
{
    process_data(data[i]);

    if (i % 1000 == 0) {
        bool is_cancelled = check_if_cancelled();
        if (is_cancelled) {
            break;
        }
    }

}

This code basically "runs/processes a query" similar to a SQL query interface:

However, queries may take several minutes to run/process and at any given time the user may cancel their query. The cancellation process would occur in the normal javascript/web application, outside of the service Worker running the wasm.

My question then is what would be an example of how we could know that the user has clicked the 'cancel' button and communicate it to the wasm process so that knows the process has been cancelled so it can exit? Using the worker.terminate() is not an option, as we need to keep all the loaded data for that worker and cannot just kill that worker (it needs to stay alive with its stored data, so another query can be run...).

What would be an example way to communicate here between the javascript and worker/wasm/c++ application so that we can know when to exit, and how to do it properly?

Additionally, let us suppose a typical query takes 60s to run and processes 500MB of data in-browser using cpp/wasm.

from How to cancel a wasm process from within a webworker