Can someone create a DH & App for Tp-Link Tapo P100 smart plug if possible?
As long as you live in a region where Alexa routines are available, You can just use the free Amazon Alexa app as an intermediary if you like. The plug will show up when you go to create an Alexa routine (not a SmartThings routine) so you can turn it on and off that way.
You need to create a simulated switch to trigger the routine from SmartThings. See the FAQ: