Show first post under thread title?

[nothing4me]

I know $thread[firstpostid], when used on the threadbit template, is the firstpostid for the thread.

However, how do I get the postbit template to show up for that post under the postbit template for the forumdisplay page?

For example, let's use https://vborg.vbsupport.ru/forumdisplay.php?f=111 as an example.
Right under the thread title, it'll show the first post of the thread using the postbit template.

I know there is an AJAX version of it. However, I want it to display without having to click anything at all.

Any suggestions? Thank you.