Is it possible to access "text ingredients" from Google home request

Yes, so your ‘this’ is Google Assistant’ and your ‘that’ is a webhook to your glitch project? In the config of the webhook you can select the ingredient to be sent, which you can see in the JSON body of the webhook request in your Glitch app. You’ll need to use the body-parser middleware (assuming you’re using Express) to be able to access that content easily.

An example setup outputting the json.body is below, so you’d need to take parts of that and add to your app:

var express = require('express')
var bodyParser = require('body-parser')

var app = express()

// parse application/x-www-form-urlencoded
app.use(bodyParser.urlencoded({ extended: false }))

// parse application/json
app.use(bodyParser.json())

app.use(function (req, res) {
  res.setHeader('Content-Type', 'text/plain')
  res.write('you posted:\n')
  res.end(JSON.stringify(req.body, null, 2))
})