There are two types of formatting in the SharePoint online, column formatting and view formatting.
If applying column formatting, the column will be formatted in all views.
If applying view formatting, all rows in the view will be formatted.
For example, change the font size in all rows of a view.
Go to All items -> Format current view -> Advanced mode -> Apply JSON codes.
{
"$schema": "https://developer.microsoft.com/json-schemas/sp/v2/row-formatting.schema.json",
"schema": "https://developer.microsoft.com/json-schemas/sp/view-formatting.schema.json",
"additionalRowClass": "sp-field-fontSize24"
}
So, there is no option to apply the formatting to one column in the only one view.
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