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```I don't know if that's what you want but ... [NodeJS]```
//BEGIN - CODE

const pulumi = require("@pulumi/pulumi");
const azure = require("@pulumi/azure");

var sub = azure.core.getResourceGroup({
    name:"my_resourcegroup"
});

console.log(sub.id);
//END - CODE

/*console outpu return

/subscriptions/[id_of_mysubscription]/resourceGroups/my_resourcegroup

*/

as pulumi already runs under a subscription seted in az cli you can also simply use...

const pulumi = require("@pulumi/pulumi");
const azure = require("@pulumi/azure");

var sub = azure.core.getSubscription()

console.log(sub.id);