After some googeling it seems that there is no official TLS 1.2 AT firmware for ESP01 from Espressif.
@MaBe started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
After some googeling it seems that there is no official TLS 1.2 AT firmware for ESP01 from Espressif.