This repo contains the script to generate language injection definitions for using playwright-python in PyCharm. From the link:
Language injections let you work with pieces of code in other languages embedded in your code. When you inject a language (such as HTML, CSS, XML, RegExp, and so on) into a string literal, you get comprehensive code assistance for editing that literal.
The script generate.py generates a file playwright-X.xml where X is the major component of the installed playwright version. Or, you can just download the last generated version directly.
After downloading, open up your settings in PyCharm → Editor → Language Injections → Import, and select the file you just downloaded.
Since the developers of playwright-python were consistent with their style, that made this script a lot easier to write. Every single occurrence of a CSS selector argument in a function uses the name selector and every occurrence of a JS expression uses the argument name expression. So it's as simple as iterating over the entire API surface, and finding methods that have arguments that match the name and type annotation of str. Both async and sync APIs are supported.