SQL server Debezium 1.9 signal documentation syntax issue

I am currently experiencing an issue with the v1.9.3 SQL server Debezium connector when using a signalling table to generate a snapshot. I have all this working but when I put a valid additional-condition to filter the results, the filter does NOT take affect. After reading and re-reading the documentation, I noticed a possible syntax issue?

 

INSERT INTO myschema.debezium_signal (id, type, data) values ('ad-hoc-1', 'execute-snapshot', '

{"data-collections": ["schema1.table1", "schema2.table2"], "type":"incremental"}

, "additional-condition":"color=blue"}'); 

 

Notice there is ONE { but TWO }...is that why my filter is not working?