Downloads: add several trackers at once with the transmitting remote control

I recently bought a QNap that I use as a download station, so I went to download files with uTorrent on my PC to download them with Transmission in QNap.

I use Transmission Remote to control downloads from my laptop and smartphone.

Unfortunately, when I try to add several crawlers to improve a frozen file, Transmission tells me that I added an invalid argument, because it clearly wants me to add crawlers one by one.

Is there a way to add several crawlers at once, like I did in uTorrent?