I couldn’t install libwebkit2gtk-4.1-dev.

environment : ubuntu 20.04

$ sudo apt install libwebkit2gtk-4.1-dev
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package libwebkit2gtk-4.1-dev
E: Couldn't find any package by glob 'libwebkit2gtk-4.1-dev'

Only I can get is libwebkit2gtk-4.0-xxx.

$ sudo apt install libwebkit2gtk-4.0-
libwebkit2gtk-4.0-37       libwebkit2gtk-4.0-dev
libwebkit2gtk-4.0-37-gtk2  libwebkit2gtk-4.0-doc

Could you help?