1)Save a structure with any name (test)
2)use this "/setblock ~ ~ ~ minecraft:structure_block{powered:1b,mode:"LOAD",posX:0,posY:0,posZ:0,name:"minecraft:test"}"
3)it will place a structure block at your location but it will not load the structure
Linked issues
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tryashtar
poweredstores whether it's already powered in order to prevent it from loading a second time on relog.