It actually would be quite difficult for adblockers to block 1st party scripts if I just embed the tracking into my JS bundle. At that point the adblocker would have to deobfuscate the code and block selective parts of the JS.
Only if you self host or proxy all of the tracking requests. Otherwise, the tracking will occur but get trapped in the browser. The moment your code tries to send the request to hotjar or any other domain, it's blocked.
Yes, hence why I said in my initial comment that I'm looking for a self hosted version, mostly because Hotjar is bloated and has unnecessary amounts of extraneous JS that slows down the page.