Google Schema.org Math solvers structured data for multiple fields - math

Question

Trying to setup schema markup for a simple math solver action with two fields. Let's say addition.
1+1=2
Here is Google's doc and example:
{
"#context": "https://schema.org",
"#type": ["MathSolver", "LearningResource"],
"name": "An awesome math solver",
"url": "https://www.mathdomain.com/",
"usageInfo": "https://www.mathdomain.com/privacy",
"inLanguage": "en",
"potentialAction": [{
"#type": "SolveMathAction",
"target": "https://mathdomain.com/solve?q={math_expression_string}",
"mathExpression-input": "required name=math_expression_string",
"eduQuestionType": ["Polynomial Equation","Derivative"]
}],
"learningResourceType": "Math solver"
}
How do we add multiple variables for two numbers?
return {
'#context': 'https://schema.org',
'#type': ['MathSolver', 'LearningResource'],
...
potentialAction: [
{
'#type': 'SolveMathAction',
target: `domain.com/?num1={num1}&num2={num2}`,
'mathExpression-input': 'required name=num1 name=num2',
eduQuestionType: ['addition', 'sum']
},
],
learningResourceType: 'Math solver'
};
Schema.org says about mathExpression (note: mathExpression-input doesnt seem to exist) but does fall under Thing > Intangible EntryPoint
A mathematical expression (e.g. 'x^2-3x=0') that may be solved for > a specific variable, simplified, or transformed. This can take many > formats, e.g. LaTeX, Ascii-Math, or math as you would write with a > keyboard.
But can this be setup for URL params to accept multiple fields within the mathExpression-input instead of a single math expression?