@Michael-Wilkinson
I Had the same question and found no way to get it done in MRA(In a simple way
).
I got myself working in Excel to find a POI solution with the help of the Visual basic inside. Have been programming 15 years ago in VB, so that was for me the short time solution.
When starting a route I mostly use google to find interesting places or get some POI GPX File.
As one of the MRA forum members came with a request I started buiding a tool in Excel that will import GPX data found on the internet and get it in excel to edit to my needs.
As I have a Garmin Montana for Walking I also want to use the POI in the Garmin.
Most of the POI have only one field, and I wanted to add as much as I can in this field, but also use the full POI of Garmin/Basecamp.
Lets get an example of the way I work now.
Working on the holidays I found for example some data in Google My Maps

I can export the KML file and import it in my Excel Tool.
(to be honest, the KML import does not work yet, the export works.)
The imported data looks like this:

Now I can edit the file and look what will be interesting around the lake
In the menu I can look up the coordinates of a row in Google, for example I want to look if Cafe Belvedere is a place I want to visit...

That looks as a place I want to go!
Hotel Berc I will have a look also, as I want to stay there.
So far , so good.
As I have a Google API key, I can ask google to get me the address of both interesting places. I can place brackets on the places I want the adress from and Google will give me those. They are added in Orange between the brackets. If I have only the address of an interesting place, I let google get me the GPS coordinates.
After I get the address I can use this data also in the other colums to fill the Garmin/Basecamp data.

The Symbol row I use to get the Garmin Icons.
After I am happy I can export it to a GPX file and import it into MRA and Basecamp.
Data Imported into Garmin:

With MRA I have to upload the GPX in my POI database and I can use it there to add "My Favorites"

Now I have all the POI in MRA, I can use them in my routes or add it to "My Favorites". You can see, the data from the name field is in MRA.
I can them make a routepoint of the POI and add more data like the picture for example.

This still does not help you to share your favorites with your mates, but you can make a GPX or KML file of you points and share it, they can import them into MRA as POI.
Making a database in MRA is for now a lot of work, and in this way I am flexible untill the MRA team has made a way to export the POI's to the Garmin.
The Google API stuff it not ready yet to share, but the GPX import/Export works OK. If you have excel, I can share the file as it is now.
Regards,
Bert