With RDS datasources, how do I insert values with colons?

We have a mutation resolver that uses RDS datasource, where the mapping template will compose a variableMap with date strings in ISO formats.

For example, when running these SQL statements for either insert or update with the date string 1970-01-01T00:00:00Z inside the variableMap, the RDS Data API returns the following error.

RDSHttp:{"message":"Cannot find parameter: 00"}

It seems that RDS data source is trying to recursively replacing variables with values, even if those are already inside a variableMap.

Is there a workaround for this?

How do I provide date-time values for RDS resolvers?