You should be able to name a banner and place it down then use your left trigger will holding a map to create a way point it dose not work at this time as of v1.14.30 bedrock addition
Comments 3
Oh and you should be able to but the banner on a shield but that dose not work in 1.14.30 could check to see if it works in 20w15a
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This feature is not in Bedrock Edition yet but has been mentioned by the developers as something that will eventually come to Bedrock. Please see https://feedback.minecraft.net/hc/en-us/community/posts/360043472171--Java-Parity-Map-Markers-for-Bedrock and upvote it to show your support.
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Doseint work in the latest beta aswell