Check if Visualforce page uses JavaScript Remoting ? JS proxies were not generated for the controller cannot use public remoted methods in Iframe? [duplicate]

Question

I have several Visualforce pages from managed package (some of them use JavaScript Remoting , some not).
And I need to show one of them (depending on the parameter) on my LWC using iFrame.

The problem that if a Visualforce page uses JavaScript Remoting i can not show it in iFrame.
Is there some way to check in Apex code if a Visualforce page uses JavaScript Remoting??

Maybe someone knows any other way how we can show Visualforce page in LWC ?

I tried the solution from this question but it did NOT help me :
Similar question

Any help will be appreciated .

Thank you.