We need this same functionality too, for cataloging the presence or absence of many different possible hazard conditions when performing visual pest surveys for potentially infested trees. If any of a dozen or so possible conditions exist that would make the tree too hazardous for the climbing teams to make a follow-up inspection of the canopy, we need to be able to indicate all of them and it is entirely too cumbersome to have a separate boolean / checkbox field for each one. Survey123 is not going to meet our needs. We need this critical functionality added to Collector. Amazing that people have been asking for it for this long and it still has not yet been added. If the real problem is you don't support it as a geodatabase field type in ArcGIS desktop, then you should fix that and support it there too. It would be a very useful feature there as well.
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