Querying multiple values to display in web map

[KarenLeu1]

I have a point dataset that I want to apply symbology on for a list of values in UniqueID. I'm trying to do this using filtering or visualization options in the web map rather than adding an attribute field, to save the step of having to update the actual data each time I want to make changes to which values are displayed.

For filtering, there doesn't seem to be an option to query UniqueID IN (1,2,3...) and one would have to set up multiple individual expressions in a Set. For symbology, I can create a New Expression but there also isn't an Arcade Function to query a list of values either. 

Are there any options I'm missing to get around this? 

[XanderBakker]

You can use Arcade to group values together and assign them a text or value to symbolize on. What values would you like to group? If you can share that I can show you how you can obtain the desired result.

[KarenLeu1]

For example, I'd like to group a list of integers 1, 155, 200 in UniqueID. How would I write that in Arcade? 

Thank you for any help!