It is not so much a setting not being there than a problem of settings not always making sense.
Studio does create a bridging layer between sparse infill and first top layer.
Some of this is just required anchor areas, like when a corner would happen to be over a void in the sparse infill or to better support rounded areas.
Some of it however is based on bridging and sparse infill settings.
For example>
If you print a large piece with just 5% infill than the first top layer needs support in the form of a bridging layer.
But when or if bridging is used depends on the bridging settings and infill parameters.
Reducing the length for bridging to apply results in bridging being applied at higher infill percentages.
Play around with those settings a bit and I am confident you can manage to make a bridging layer show up in the slicer preview.