How to get href from rte?

I have this rte toolbar where you can type and click 'save' and it's going to create a link for the selected text. but the problem is that the value of the input field should be dynamic based on selected text. If the selected text has href and the input field should show the href in there. How do i get href for the selected text in rte result or update function? This is a piece of my code

this.editor.RichTextEditor.add('custom-link', {
          icon: '<div><input name="link" id="custom-link-input" value="" /><button type="submit">save</button></div>',
          attributes: {title: 'Link', class: 'gjs-rte-action custom-link'},
          event: 'change',
          result: (rte) => {
            rte.insertHTML(`<a href="${this.currentLinkValue}">${rte.selection()}</a>`);
          },
          update: (rte, action) => {
            console.log('2')
            console.log('rte.selection().toString() = ', rte.selection().toString());
            console.log('this.editor.getSelected() = ', this.editor.getSelected())
             // here i'd like to get the href of the selected text if it has one.
          }
        });

document.getElementById('custom-link-input').addEventListener('input', (e) => {
          this.currentLinkValue = e.target.value;
        });

thank you Artur