Yes, I add this myself. The following is the .json file:
{
"build": {
"f_cpu": "24000000",
"size_iram": 256,
"size_xram": 1024,
"size_code": 14336,
"size_heap": 128,
"mcu": "ch552t",
"cpu": "mcs51"
},
"frameworks": [],
"upload": {
"maximum_ram_size": 1280,
"maximum_size": 14336,
"protocol": "stcgal",
"stcgal_protocol": "stc15",
"protocols": [
"stcgal"
]
},
"name": "Generic CH552",
"url": "http://www.wch.cn/product/CH552.html",
"vendor": "WCH"
}
ch552 is a cheap 8051 MCU made in China with USB support.