ofxImGui + ofxJsonSettings binding parameters

I’m using ofxImGui and I want my gui float slider to bind to an ofxJsonSettings variable as follows:

In ofApp.h I do the following:

ofParameter<float> test{ "Test Float", Settings::getFloat("para"), 0.0f, 1.0f };
ofParameterGroup testing{ "Test Group", test };

In ofApp.cpp I do the following:

 if (ofxImGui::BeginTree(this->testing, mainSettings))

The issue is that the ofxImGui::AddParameter() function only accepts binding to an ofParameter, so is there a way to bind the ofxJsonSettings::Settings::getFloat() to the ofParameter?