I have a field in my form called "Other - SS" that I only want displayed when a checkbox field called "Specialized Services" has one of the options in it called "Other", checked.
From my testing you can use the Equal option as it will function as a CONTAINS function. The user can check several different options with the checkbox but the conditional field won't appear unless the user selects the correct option for the field to be displayed. See my Screenshot
I've tested it link this and it works fine. The screenshot is from a Conditional group on the Form that I was testing.
I see that solution does work. It would be nice to know if the documentation I noted could be used in a similar scenario in the future. If it is not something that is supported, what is the purpose of the documentation?