Render conditions when value comes from another model

I’m searching for ideas on how to conditionally render a field from Model A based on whether or not a field in Model B contains a value from a field in Model C.

1) Conditional Rendering field (A) based on field in another model (B) using the “contains” will not work because Conditional Rendering does not apply merge syntax on the “value” property (C).
2) Formula fields do not have a “Contains” operator so unable to add UI only field to Model B and check if field contains value from field in Model C

Example (note that example is not real world, just demonstrating the use case):
Model A - Contact has field “MyField”
Model B - Account has field “Members” which is a comma delimited list of aliases
Model C - User has a field “Alias”
Rule - Show Contact.MyField if Account.Members contains User.Alias

The only solution I’ve come up with thus far is to resort to javascript with a UI only model and creating the row programatically.

I have 100+ pages and they all will have some need for this - the largest pages could have upwards of 50+ of these conditional fields.

Anyone have any suggestions/ideas outside of javascript?  Am I overlooking a way formula fields could be used?  I’m hoping that I’m just really really tired and overthinking this 🙂

Appreciate any insight/thoughts/suggestions, thank you!