Service backed records passing parameters - Filtered

Reference: . Example : https://docs.appian.com/suite/help/24.1/Service-Backed_Record_Tutorial.html Look for SpaceX_getFilteredLaunches_recordDataSource

Here is what I want to achieve - 

1. I want to create a readonly grid using recordtype  (e.g.A recortype that points to SpaceX_getFilteredLaunches_recordDataSource)

2. The data for this grid should come from a record type data source (service backed e.g. ), the record datasource has rule input parameters for filters (check SpaceX_getFilteredLaunches_recordDataSource)

3. The grid needs to pass initial parameters to the recordtype data in the grid so it is filtered and not bring in all data

4. The question is how do i pass the parameters to the record type data source from the grid

5. Example : https://docs.appian.com/suite/help/24.1/Service-Backed_Record_Tutorial.html Look for SpaceX_getFilteredLaunches

The webservice endpoint needs parameters passed , I am not sure if the recordtype will pull all the data if the datasource is not a filtered datasource and then does the queryfilter runs on top of the pulled records OR the queryfilter will translate to query parameter of the webservice endpoint ? If its not the latter the performance will be an issue as the payload is going to be large .. which is why using filteredDataource is  would make more sense.  But if we define a recordType using the filtered dataource , how do we pass the input parameters when creating this type of recordtype?  When i tried to create a recordtype using filtered datasource, it defaults to 'unsynced' which doesn't support  filters in a!queryrecordtype (Record types sourced from a web service or other expression only support filter parameter if the data is synced). Also if i use the filtered datasource for the data in the grid, it doesn't support search and user filters .. lot of constraints