I'm debugging c# in visual studio

I added an object to the watch window

Given some value, is there any way to search which field holds this value?

This is now natively supported in Visual Studio 2019

VS Code Search

Search w/ Expressions in VS 2022

You can sort of search by expressions by pinning the property you're looking for (search property name to find it), and then select "Show Pinned Member Names in Values". Then you can search for a match in the value prop_name = value

Search Expression

Further Reading