If you want to keep it solely in Glide, I would suggest using Glide’s JSON template/JSON columns, or JavaScript to construct a HTTP call body that fits with Glide’s API.
Then, upon a button click, use the value above to add multiple rows. However, you must have access to the Call API action to do this.
An alternative is like Robert said, constructing a JSON of info for all rows you want to add (and ideally it should be the same as the HTTP call body above), then use a Trigger Webhook action to send that to a Make webhook, do a HTTP call to batch add the rows over there.