Since few, if any, people are using census microfilms now, I'd recommend not bothering to cite them.
FWIW, here's a comment from the Evidence Explained webpage, about citing census microfilms (https://www.evidenceexplained.com/node/1680 : accessed 2 September 2023). (Evidence Explained gives 'the ideal citation format' for Wikitree (https://www.wikitree.com/wiki/Help:Sources : accessed 2 September 2023):
'Do we really need to do all that for a census citation? Opinions vary among researchers. A decade or two ago, when most people were still consulting censuses as microfilm at their local libraries, identifying the exact film number could matter significantly. Many censuses underwent more than one filming in the early-to-late 1900s. Some libraries still had inferior "first filmings" that they could not afford to replace, even though legibility was poor.
'Today, the major providers are all digitizing from the best film available. Some are putting problematic film images through enhancement procedures to make them more legible. In EE's opinion, the more important issue today is the identity of the provider. Past that point, our source-of-the-source data might simply quote whatever origin the provider offers.'