Import GeoJSON features as layers

I have a GeoJSON file with two polygon features and I want to cut one feature so that it fits entirely into the other one.

2024-09-09-21-34-42-qgis-ltr-bin

I found Vector > Geoprocessing Tools > Intersection which seems to do exactly what I want

Unfortunately it operates on layers and when I imported my GeoJSON file with Layer > Add Layer > Add Vector Layer all the polygon features of the GeoJSON file were imported into a single layer.

How can I import the GeoJSON features into separate layers so that I can run an Intersection operation on it?