This might be late for you but I hope this helps someone. I have written two tutorials for both SPA website and for Cordova how to set up Google Tag Manager / Google Analytics:
https://jannerantala.com/tutorials/quasar-framework-google-tag-manager-and-analytics-setup-for-an-spa-website/
https://jannerantala.com/tutorials/quasar-framework-google-analytics-setup-for-cordova-app/

@thamibn I always set the Axios header after the login. Before the login all requests are made without the Bearer token:

this.$http.post('/login', {
username: this.email,
password: this.password
})
.then(res=> {
localStorage.token = res.token;
this.$http.defaults.headers.common['Authorization'] = 'Bearer ' + localStorage.token;
})

@thamibn I always set the Axios header after the login. Before the login all requests are made without the Bearer token:

this.$http.post('/login', {
username: this.email,
password: this.password
})
.then(res=> {
localStorage.token = res.token;
this.$http.defaults.headers.common['Authorization'] = 'Bearer ' + localStorage.token;
})

This might be late for you but I hope this helps someone. I have written two tutorials for both SPA website and for Cordova how to set up Google Tag Manager / Google Analytics:
https://jannerantala.com/tutorials/quasar-framework-google-tag-manager-and-analytics-setup-for-an-spa-website/
https://jannerantala.com/tutorials/quasar-framework-google-analytics-setup-for-cordova-app/