I found this (https://spdx.org/licenses/) which seems to include if it's OSI approved or not (so I guess the assumption is that it was rejected by OSI if it isn't approved, but could be pending also).

Then I came across this (https://opensourcewatch.beehiiv.com/p/open-source-initiative...) which says (in 2023) that OSI is adding "Rejected, Approved, Preferred" categories to their labeling system, but I don't find the results of this work, if it was implemented.

We shouldn't put too much stock in what the OSI thinks open source is, since it's a consortium of big tech companies who benefit from more permissive licensing.