I feel, in my bones, that this must have been done for C, too: could someone google it for me? Doing a search for "... C Electron" is a bit fruitless.
There is webview, a low level C library with various bindings that can be used to create a webview using os provided browser and interact with it. Wrt. featureset its is a lot more simpler and lower level than both electron and wails.