Is there a way to run D3.js in response to an http request using Node/Express without blocking the server?

I have used d3.js to generate svg/html on the server using node and jsdom. I have also tested the use of d3 on the server in a web request to generate dynamic svg/html to then use in a template/view (ejs). The problem with this is any significant d3.js code will block the server and will force additional web requests to wait until the svg/html is generated. Is there a way to generate dynamic svg/html in a web request using d3 in nodejs/express without blocking the server?

I've wondered if there is an asynchronous way to write d3, or perhaps a way to use additional workers to generate the svg/html with d3 (and jsdom) in a way that avoids blocking.

Here are some reasons one might want to do this on the server instead of the client: pre-rendering the svg/html and using it in an express template will provide uniform page loading for the user without the "flash" of svg/html being drawn after the page loads like when using d3 in the client. You could also avoid having to send a lot of data to the browser and you could keep d3 code proprietary.

Here is a basic example of what I mean by using d3 in an express route which could block the server for other incoming web requests.

app.get("/", async function(req, res) {
    
    // get dynamic data from database based on req.query
    let data = await dbConnection.query(dynamic_sql)

    // create simulated DOM using jsdom. This step will block server.
    const { document } = (new JSDOM(``)).window;

    // use d3 to draw svg. This step will block server.
    let selection = d3.select(document).select("body")
    
    selection.selectAll("circle")
    .data(data).enter()
    .append("circle").attr("r", 5).attr("cx", 10).attr("cy", 10)

    // extract svg string
    let svgString = selection.node().innerHTML

    // pass svgString to template to render page for client
    res.render("/", {svgString: svgString})

}

Please let me know if you have any thoughts!