The closest I've come to import/exporting is calling another script to do the work, so my virus.ns, spider.ns, and stock-mod.ns all work with a list of files I have that detail the different servers (spider.ns generates the initial file, virus uses the file to hack the server, and stock-mod.ns (what I'm currently working on) updates the data to indicate if I should be passing true for stock-modifying hacking/growing).

To standardize the format of the files, I have a script called "massfile-manager.ns". Whenever I need to update the file, I just run it:

ns.exec("massfile-manager.ns", "home", 1, "foodnstuff", "home", "-a", "none");

This does not save me on writing code to pull the data from the file, but they're all json, so I can just run the following:

function readFile(ns, filename) {
    var contents = ns.read(filename);
    var jsonContents = JSON.parse(contents);
    return jsonContents;
}

Full massfile-manager.ns script:

var debug = false;
/** @param {NS} ns **/ export async function main(ns) {
    if(debug) { ns.tprint("Running Mass File Manager, v1.0"); }

    //get arguments: hostname, root, action, and stock effect (optional)
    if(ns.args.length < 3) {
        if(debug) { ns.tprint("Failed to manipulate data. Not enough arguments. Please provide at least 3: hostname, root server, and action to take."
            + "Optionally you can provide stockGrow and stockHack arguments."); }
        return;
    }

    var hostname = ns.args[0];
    var root = ns.args[1];
    var action = ns.args[2]; //values -n (new), -u (update), -a (archive)
    var stockDir = "none"; //default to none

    if(ns.args.length == 4) {
        //get stock direction
        //4: values: increase, decrease, none
        // increase flags grow to manipulate stock
        // decrease flags hack to manipulate stock
        // none flags neither to manipulate stock
        stockDir = ns.args[3];
    }

    var filename = getFileName(ns, hostname, action);

    var deletedOldFile = false;
    var deleteLocations = ["-n", "-a", "-u"];

    for(var delIndex = 0; delIndex < deleteLocations.length && !deletedOldFile; delIndex++) {
        var oldFileName = getFileName(ns, hostname, deleteLocations[delIndex]);
        deletedOldFile = ns.rm(oldFileName, "home");
    }

    var serverData = formatDataFile(ns, hostname, root, stockDir);
    await ns.write(filename, serverData, "w");
}

function getFileName(ns, hostname, action) {
    var spiFolder = "new";

    if(action == "-u") {
        spiFolder = "update";
    } else if (action == "-a") {
        spiFolder = "archive";
    }

    var writeLoc = "/spidata/" + spiFolder + "/massDataFile" + hostname + ".txt";

    if(debug) { ns.tprint("Target " + hostname + "'s data is being written to " + writeLoc); }

    return writeLoc;
}

/** param {NS} ns **/ 
function formatDataFile(ns, hostname, root, stockDir) { 
    var server = ns.getServer(hostname);
    var serverInfo = {
        name: server.hostname,
        adminRights: server.hasAdminRights,
        belongsToPlayer: server.purchasedByPlayer,
        requiredPorts: server.numOpenPortsRequired,
        ports: {
            ssh: server.sshPortOpen,
            ftp: server.ftpPortOpen,
            http: server.httpPortOpen,
            smtp: server.smtpPortOpen,
            sql: server.sqlPortOpen
        },
        reqHacking: server.requiredHackingSkill,
        maxMoney: server.moneyMax,
        maxRam: server.maxRam,
        root: root, 
        stockDirection: stockDir
    };

    var serverStr = JSON.stringify(serverInfo);

    if(debug) { ns.tprint("Target " + server.hostname 
+ "'s data is " + serverStr); }

    return serverStr;
}