Hi, regarding your question, there is a comfortable app to collect street view images - Mapillary. In general it mostly used to collect tracks, but it also has a nice feature of taking single image. If you'll use it to catch new places - other mappers will also be able to use these photos for their mapping. This provider is fully approved for OSM usage and nicely integrated in many popular editors.

app link is: https://www.mapillary.com/app

Here is my personal example where I took a picture of bomb shelter to later map it: https://www.mapillary.com/app/?pKey=1027066689507715

there are more similar platforms https://kartaview.org/map and https://mapilio.com/app but only Mapillary allows single-picture mode.