Show Content Type description in List Form Header

As the subject line indicates, I'm trying to get a list's content type description to show in the header.

{
"elmType": "div",
"attributes": {
"class": "ms-borderColor-neutralTertiary"
},
"style": {
"width": "99%",
"border-top-width": "0px",
"border-bottom-width": "1px",
"border-left-width": "0px",
"border-right-width": "0px",
"border-style": "solid",
"margin-bottom": "16px"
},
"children": [
{
"elmType": "div",
"style": {
"display": "flex",
"box-sizing": "border-box",
"align-items": "center"
},
"children": [
{
"elmType": "div",
"attributes": {
"iconName": "Street",
"class": "ms-fontSize-42 ms-fontWeight-regular ms-fontColor-themePrimary",
"title": "Details"
},
"style": {
"flex": "none",
"padding": "0px",
"padding-left": "0px",
"height": "36px"
}
}
]
},
{
"elmType": "div",
"attributes": {
"class": "ms-fontColor-neutralSecondary ms-fontWeight-bold ms-fontSize-24"
},
"style": {
"box-sizing": "border-box",
"width": "100%",
"text-align": "left",
"padding": "21px 12px",
"overflow": "hidden"
},
"children": [
{
"elmType": "div",
"txtContent": "Flower Crop Details Form: [CONTENT TYPE DESCRIPTION]"
},
{
"elmType": "a",
"txtContent": "View data in Excel for print-out",
"attributes": {
"target": "_blank",
"href": "https://me-my.sharepoint.com/personal/me/Documents/Office%20365%20Documents/Excel/Garden.xlsx?web=1",
"class": "ms-fontColor-themePrimary ms-borderColor-themePrimary ms-fontWeight-regular ms-fontSize-m ms-fontColor-neutralSecondary–hover ms-bgColor-themeLight–hover"
}
}
]
}
]
}

I would like it to show in the header text as written in the JSON code [CONTENT TYPE DESCRIPTION].
Yes, I can manually add it, but I want to use something like [$Description], but that syntax doesnt work.
I've tried to search but everything returns how to create a content type because the question contains the words "Content Type" 

I'm beginning to think it may not be possible unless anyone has a snazzy trick MSFT hasn't mentioned or is located in a spot I've heretofore been unable to locate.
Thanks.