focus among dialogs/modals (multiple open dialogs)

[BigSillyTiger]

hi everyone:
I have a focus among dialogs(modals) issue, for now, if I open a dialog-A, the focus will be trapped within this A dialog.
What if I have a scenario which is

1. open dialog-A, click a button to open dialog-B meanwhile the dialog-A remain open
2. within dialog-B, I have a form to fill, but right now the focus is still trapped in dialog-A

is there any way to have the focus shifted to the current / newly opened dialog?