Push Datasets - double quotes in JSON Values

Hello - I'm using the PostDataset from the Reset API to create a dataset in PBI service. I'm trying to create a calculated field which contains double quotes. However it's not working because the double quotes are being interpated as the end of the value. Below is an alterved version of the request body i'm using, where the red highlight is where i'm running into an error.

{
"name": "DatasetNew",
"tables": [
{
"name": "TableA",

.......

"measures": [
{
"name":"Avail",
"expression": "SWITCH(TRUE(),VALUES('SWITCH Table'[Dataset]) = "Day", [DaysSum],v0 )"
}
]

}

]
}

https://docs.microsoft.com/en-us/rest/api/power-bi/pushdatasets/datasets_postdatasetingroup