Is this possible and how?
This is what I’ve came up with, but it doesn’t work.

node_helper.js

// P1 Meter section
//
getMHW_P1: function(urlP1) {
        // Make a GET request using the Fetch API for the P1 Meter
        fetch(urlP1)
          .then(response_P1 => {
            if (!response_P1.ok) {
              console.error('MMM-MyHomeWizard: Network response was not ok');
            }
            return response_P1.json();
          })

          .then(result_P1 => {
            // Process the retrieved user data
            console.log(result_P1); // Remove trailing slashes to display data in Console for testing
            this.sendSocketNotification('MHWP1_RESULT', result_P1);
          })

          .catch(error => {
            console.error('Error:', error);
          });
  },

  socketNotificationReceived: function(notification, payload_P1) {
            if (notification === 'GET_MHWP1') {
            this.getMHW_P1(payload_P1);
            }
  },
  
  // Water Meter Section
  //
  getMHW_WM: function(urlWM) {
        // Make a GET request using the Fetch API for the Water Meter
        fetch(urlWM)
          .then(response_WM => {
            if (!response_WM.ok) {
              console.error('MMM-MyHomeWizard: Network response was not ok');
            }
            return response_WM.json();
          })

          .then(result_WM => {
            // Process the retrieved user data
            console.log(result_WM); // Remove trailing slashes to display data in Console for testing
            this.sendSocketNotification('MHWWM_RESULT', result_WM);
          })

          .catch(error => {
            console.error('Error:', error);
          });
  },

  socketNotificationReceived: function(notification, payload_WM) {
            if (notification === 'GET_MHWWM') {
            this.getMHW_WM(payload_WM);
            }
  },

MMM-MyModules.js

// <-- P1 Meter Section -->
	
	// This processes your data P1 Meter
	processMHW_P1: function(data_P1) { 
		this.MHW_P1 = data_P1; 
		console.log(JSON.stringify(this.MHW_P1)); // uncomment to see if you're getting data (in dev console)
		this.loaded = true;
	},

	// this tells module when to update
	scheduleUpdate: function() { 
		setInterval(() => {
		    	this.getMHW_P1();
			this.getMHW_WM();
		}, this.config.updateInterval);
		this.getMHW_P1();
		this.getMHW_WM();
		var self = this;
	},
	  
	// this asks node_helper for data
	getMHW_P1: function() { 
		this.sendSocketNotification('GET_MHWP1', this.urlP1);
	},

	// this gets data from node_helper
	socketNotificationReceived: function(notification_P1, payload_P1) { 
		if (notification_P1 === "MHWP1_RESULT") {
		// this notification doesn't come back on error..
		this.processMHW_P1(payload_P1);
		this.updateDom(this.config.initialLoadDelay); 
		}
	},
	
//<-- Water Meter Section -->
	
	// This processes your data Water Meter
	processMHW_WM: function(data_WM) { 
		this.MHW_WM = data_WM; 
		console.log(JSON.stringify(this.MHW_WM)); // uncomment to see if you're getting data (in dev console)
		this.loaded = true;
	},

/*	// this tells module when to update
	scheduleUpdate: function() { 
		setInterval(() => {
		    	this.getMHW_WM();
		}, this.config.updateInterval);
		this.getMHW_WM();
		var self = this;
	},
*/	  
	// this asks node_helper for data
	getMHW_WM: function() { 
		this.sendSocketNotification('GET_MHWWM', this.urlWM);
	},

	// this gets data from node_helper
	socketNotificationReceived: function(notification_WM, payload_WM) { 
		if (notification_WM === "MHWWM_RESULT") {
		// this notification doesn't come back on error..
		this.processMHW_WM(payload_WM);
		this.updateDom(this.config.initialLoadDelay);
		}
	},

I hope somebody can help me with this.
I'm not a programmer, but I try to do my best ;-)