style variation with only typography and spacing rules

gistfile1.txt

{
	"$schema": "https://schemas.wp.org/trunk/theme.json",
	"version": 2,
	"title": "Maelstrom 2",
	"settings": {
		"typography": {
			"fontFamilies": [
				{
					"fontFace": [
						{
							"fontFamily": "Cardo",
							"fontStyle": "normal",
							"fontWeight": "400",
							"src": ["file:./assets/fonts/cardo/cardo_normal_400.woff2"]
						},
						{
							"fontFamily": "Cardo",
							"fontStyle": "italic",
							"fontWeight": "400",
							"src": ["file:./assets/fonts/cardo/cardo_italic_400.woff2"]
						},
						{
							"fontFamily": "Cardo",
							"fontStyle": "normal",
							"fontWeight": "700",
							"src": ["file:./assets/fonts/cardo/cardo_normal_700.woff2"]
						}
					],
					"fontFamily": "Cardo",
					"name": "Cardo",
					"slug": "body"
				},
				{
					"fontFace": [
						{
							"fontFamily": "Jost",
							"fontStyle": "normal",
							"fontWeight": "100 900",
							"src": ["file:./assets/fonts/jost/Jost-VariableFont_wght.woff2"]
						},
						{
							"fontFamily": "Jost",
							"fontStyle": "italic",
							"fontWeight": "100 900",
							"src": [
								"file:./assets/fonts/jost/Jost-Italic-VariableFont_wght.woff2"
							]
						}
					],
					"fontFamily": "\"Jost\", sans-serif",
					"name": "Jost",
					"slug": "heading"
				},
				{
					"fontFamily": "-apple-system, BlinkMacSystemFont, avenir next, avenir, segoe ui, helvetica neue, helvetica, Cantarell, Ubuntu, roboto, noto, arial, sans-serif",
					"name": "System Sans-serif",
					"slug": "system-sans-serif"
				},
				{
					"fontFamily": "Iowan Old Style, Apple Garamond, Baskerville, Times New Roman, Droid Serif, Times, Source Serif Pro, serif, Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol",
					"name": "System Serif",
					"slug": "system-serif"
				}
			],
			"fontSizes": [
				{
					"fluid": false,
					"name": "Small",
					"size": "1rem",
					"slug": "small"
				},
				{
					"fluid": false,
					"name": "Medium",
					"size": "1.2rem",
					"slug": "medium"
				},
				{
					"fluid": {
						"min": "1.5rem",
						"max": "2rem"
					},
					"name": "Large",
					"size": "2rem",
					"slug": "large"
				},
				{
					"fluid": {
						"min": "2rem",
						"max": "2.65rem"
					},
					"name": "Extra Large",
					"size": "2.65rem",
					"slug": "x-large"
				},
				{
					"fluid": {
						"min": "2.65rem",
						"max": "3.5rem"
					},
					"name": "Extra Extra Large",
					"size": "3.5rem",
					"slug": "xx-large"
				}
			]
		}
	},
	"styles": {
		"blocks": {
			"core/button": {
				"variations": {
					"outline": {
						"spacing": {
							"padding": {
								"bottom": "calc(0.8rem - 2px)",
								"left": "calc(1.6rem - 2px)",
								"right": "calc(1.6rem - 2px)",
								"top": "calc(0.8rem - 2px)"
							}
						}
					}
				}
			},
			"core/site-title": {
				"typography": {
					"fontFamily": "var(--wp--preset--font-family--heading)",
					"fontWeight": "normal"
				}
			},
			"core/navigation": {
				"typography": {
					"fontSize": "var(--wp--preset--font-size--small)",
					"fontWeight": "normal"
				}
			}
		},
		"elements": {
			"button": {
				"spacing": {
					"padding": {
						"bottom": "0.98rem",
						"left": "1.6rem",
						"right": "1.6rem",
						"top": "0.8rem"
					}
				},
				"typography": {
					"fontFamily": "var(--wp--preset--font-family--heading)",
					"fontSize": "var(--wp--preset--font-size--small)",
					"fontStyle": "normal"
				}
			},
			"heading": {
				"typography": {
					"fontFamily": "var(--wp--preset--font-family--heading)",
					"letterSpacing": "0"
				}
			}
		}
	}
}