yes, Retool come with lodash.
it work for me.
{{_.values({a:"sss"})}}
Copy this and test.
May there is some problem with your questionTypesForSelection.value,
You can test it with {{questionTypesForSelection.value}} to see if its value is right.
If not work, pls let me know which type retool you use, cloud or self-host, and version?