Custom UI while using Flexmonster

Hi ya support,
 
Got sort of an odd question. I'm trying to design the following stack and wondering if it is possible.
 
High Charts <- Flexmonster (Custom API) -> Our API -> Snowflake
 
However, I just want Flexmonster to do the API calls, shaping the data, and passing it to Highcharts. I do not want to use the Flexmonster UI. I want to code my own custom UI in React which allows you to select Rows, Columns, Values, Filters, etc.
 
Essentially every time a user selects a Row/Column/Value/Filter in my custom UI, I want to update Flexmonster with those selections and then have Flexmonster make the API call and then update Highcharts. similarly, I'll have a dropdown for chart type(pie, line, etc) and I'd pass that to Flexmonster which would cause Flexmonster to update Highcharts. I want Flexmonster UI itself to be completely hidden.
 
Is this possible?
Thanks!
Patrick