Question OCSP stapling plus... expect-staple & must-staple

[learning_curve]

We have OCSP stapling running well, on domains secured using Let's Encrypt certificates and on other domains that are secured, using other brand certificates, NOT Let's Encrypt certificates. In both cases, simply by adding commands to each domain individually via nginx additional directives (after some recent Plesk updates / changes)

Our next question is; Has anybody with a similar server setup to us (see signature) progressed any further? i.e. Initially to run expect-staple and then finally, to include must-staple and if so, how did you technically achieve this within Plesk?

Or, are both these addditonal steps just a passsing phase similar to the direction that HPKP now may be heading in?