Emergency Contact Checkbox Readonly in Redwood

Hi Team,
 
In the Family and Emergency Contacts page, we have a requirement where the emergency contact checkboxes need to be checked by default and set as readonly. While we have successfully managed to make the checkboxes checked by default, we are facing an issue making them readonly.
 
Could anyone provide suggestions or guidance on how to make the emergency contact checkbox readonly while keeping it checked by default?
 
Regards,
Kavya