Connection of PPR pipes and hose fittings

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In the process pipeline system, the piping material used for the fresh water system is PPR. When connecting to hose fittings, the designed method involves first using a flange to change the material – that is, a 1-inch PPR flange is connected to a 1-inch stainless steel welded end flange – and then a stainless steel pipe is used to connect to the hose fitting. But it is said that there are no PPR flanges of 1 inch, so I would like to ask: can PPR pipes and hoses be connected directly? Or can their connection be achieved through other means? (I saw a provision in a PPR pipeline installation specification stating that when connecting polypropylene water supply pipes to metal fittings, polypropylene fittings with metal inserts should be used as a transition element; these fittings are joined to the plastic pipes by heat fusion, while they are connected to the metal fittings or sanitary fixtures using threaded connections.) Is anyone familiar with such pipe fittings? ）