Generic:
set_property -dict [ list CONFIG.ADVANCED_PROPERTIES {key1 {key2 ... {keyn value ...}}} ] [get_bd_cells smartconnect_instancename]
Example:
set_property -dict [ list CONFIG.ADVANCED_PROPERTIES {__view__ {functional {M00_Exit {NUM_READ_THREADS 2 NUM_WRITE_THREADS 2}}}} ] [get_bd_cells smartconnect_0]