When you use for example:

/setblock ~ ~ ~ minecraft:structure_block 1 {name=test,mode=LOAD}

The structure block that will be created will be data mode with no info, and if you block-update it (shift-place a block in side of it) the texture will change to load, whoever the name in top of it will stay "Data:" and if you open it the GUI will be in data mode and when you close the texture will be back to data.