I think I might have just done that but I'm on 1.20.81 so I don't notice much of a difference so it may not be worth to trouble but maybe the idea will work for other packs.
I downloaded and unzipped the file and replaced the pack.mcmeta with a manifest.JSON. the manifest.json you can just create with a text editor (I use notepad++) and it should contain as follows:

{ "format_version": 2, "header": { "description": "Custom Resource Pack", "name": "Fresh Leaves Resource Pack", "uuid": "49e3b3dd-81fa-4bb5-9aae-1e97c68a976f", "version": [1, 0, 0] }, "modules": [ { "description": "Fresh Leaves Texture Changes", "type": "resources", "uuid": "b64d95d1-0b89-4c73-9637-82a347e3cd34", "version": [1, 0, 0] } ]}

The UUIDs I came up with using a random generator. I believe you can use mine. But if you plan to change it or add it to anything else you would need new ones. Also if you plan to try to use this process for another pack you'll need to regenerate two new UUIDs.
Once you've created the manifest.json, select each of the files within the fresh leaves folder and compress them into a zip file. Do not just select the folder containing these four files to compress. You need to select each one individually and compress into a new file. Then just change the extension from .zip to .mcpack. It may prompt you and say it might cause problems but go ahead and say yes. Then go into whichever device you're using... Me personally it was my Android. I had to download a file manager to manage my file system in order to get this to work but you click on The new file you created or tap and hold and select "open with" and then select Minecraft and it should install the pack. I have the particular world that I'm using on realms so when I will swap over to my iPad which I play with a controller, it asked me to download it automatically.
Hope that helps!

im pretty sure u cant have like 3d textures on bedrock 😭