This is "built into" PowerToys Run. In fact, at the beginning that was all it could do.
It's now been moved into a bundled plugin named after the original app that was morphed into this: WindowWalker. I don't remember what the special character you have to type to target the plugin is because I made my installation of PowerToys Run use that plugin by default without a prefix and I disabled all the other plugins.
Re:PowerToys – open-source Windows utilities
by artimaeis on Sunday May 08, 2022 @04:58PM
(#31308087)
As of the version I have installed (0.58) WindowWalker is included by default in the results of the PowerToys Run results. To target windows specifically the default character is `<`.
The ability to search for an application and bring those windows into focus. This is my primary way of switching between applications (except for the terminal which I have bound to Ctrl+Shift+Space). It's much easier for my brain to just type the first two letters of the app I want to focus then to remember the state of the app switch history.