Are space properties indexed and can be searched in CQL?

Content properties in Confluence Cloud can be made searchable in CQL using Content Property Index Key Configuration entities. This is really powerful!

Is something like this available also for space properties?
(I haven’t found this in the documentation, but it sounds complementary…)

For example, I want to add number-type space property called “foo” to my spaces, then search for all content that is in a space where “foo = 123”.