If you want to open the new form in another list using SharePoint Lists JSON formatting, it is pretty straightforward.
All you need to do is to use the href property in a link object inside of your custom HTML generated by list formatting, and point it to the relative path of the new item form of the list you want to open, for example:
/sites/<your site>/Lists/<your list>/NewForm.aspx
Imagine you have an issues list in your site, you could use the below JSON template:
{
"$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
"elmType": "a",
"attributes": {
"class": "ms-fontColor-themePrimary ms-fontWeight-semibold",
"target": "_blank",
"href": "/sites/SharePointFormsDemo/Lists/Issues/NewForm.aspx"
},
"style": {
"text-decoration": "none"
},
"children": [
{
"elmType": "span",
"attributes": {
"iconName": "CircleAdditionSolid"
},
"style": {
"margin-right":...
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More About This Author

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SharePoint and Office 365 Consultant/Developer always trying to get the best from Microsoft stack (Microsoft 365/Azure/Power Platform and related stuff).
Living in Ireland since 2018, I had previously worked in Brazil as a consultant/developer for Office 365, SharePoint and related technologies for almost 10 years.
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Modern Workplace16 September 2023Call authenticated external APIs using JavaScript from Power Pages
Modern Workplace9 September 2023Using SharePoint list formatting and Power Automate to create linked items (via LookUp field) in a related list
Modern Workplace1 September 2023Using the HTTP with Azure AD connector in Power Automate to create Planner Plans and add them as Teams tabs
Modern Workplace26 August 2023Create an Issue Tracker App using Power Apps Copilot (Preview)