Actually you could use CSS to change the Tile Label, not as easy as a click 'Override name' option but doable with a copy paste code for each tile:
div[style^="grid-area: 1 / 1 / 2 / 2"] .tile-title {
visibility: hidden;
}
div[style^="grid-area: 1 / 1 / 2 / 2"] .tile-title:after {
content: 'NEW TILE LABEL';
visibility: visible;
display: block;
}
Where grid-area is: "row-start / column-start / row-end / column-end"
So if you want to target the third tile in the second row it would be: "2 / 3 / 3 / 4"
And for a tile with a 2 row width on the first row and column it would be: "1 / 1 / 2 / 3"
