no you send a request (actualy at some point the Program Manager will be doing that), you catch the response with the data (usualy some big sysex message), you interpret that message (read the bytes, toggle some bits, decompress, unpack whatever it takes to get the actual numeric values for your modulators), once you got those values you assign them to modulators in the panel, this can be automated in many ways (you can have an array of modulator name->index where the index will be some kind of pointer to a value in the sysex dump, so that when you assign the values you don’t need to access each modulator directly). There are hundreds of possibilites here. But that’s how this will work in general
SysEx program request
Receive dump data
Parse dump data
Assign values to modulators